+0

# @Temporary sticky questions

+18
2091
290
+106943

Just so I can find them - Melody  (other people welcome to put their temporary ones here too)

We probably need a better method!

(4-May-14)

Personal interest post

http://web2.0calc.com/questions/arc-and-how-to-find-an-angle

http://web2.0calc.com/questions/1-i-16-1-i-15   (complex numbers)

Very funny general interest post.

http://web2.0calc.com/questions/why-does-my-oldish-texas-instruments-not-have-a-prb-button

These ones promote discussion of calculator outputs (as well as some criticisms)

http://web2.0calc.com/questions/if-3-4x-1-what-is-x_1#r103588

http://web2.0calc.com/questions/4x-5--3x-4-3x-10-1#r103592

http://web2.0calc.com/questions/how-do-you-get-100-with-only-the-numbers-3-4-and-4

May 4, 2014

#12
+106532
+11

Pizza Pie Problem: You and your two friends have purchased a pizza of radius "r" and you wish to divide it into three equal pieces by making vertial cuts similar to the ones shown below - obvously one of the cuts  is in the center.....when you find one more, you'll have the problem solved!!! (Note: The illustration indicates a radius of 3 , but the actual radius doesn't matter, since all circles are similar.)  The question is: Where should the cuts be made??

Your answer could be in terms of "r," or in terms of some angle "theta."  You might also consider letting the exact center of the pizza be (0,0).  Hint: The problem CAN  be solved with calculus, but trig will work, too - I've done it both ways - if I remember correctly. Also.......I believe you'll need a "solver" to "finish" your answer out......you will know when you have reached that point!!

Good luck!!

May 15, 2014

#2
+106943
+3

thurs 8/5/14 through to saturday 10/5/14

This one has not yet been answered

http://web2.0calc.com/questions/help_373#r104842

Thought provoker question

Something a little different for senior school students

http://web2.0calc.com/questions/0-10-6-0-v-2-0-00050v-2-0-033

Sequence question - Turned out to be nonsense but intoduced  "The online encyclopedia of integer sequences" OEIS.

http://web2.0calc.com/questions/what-is-the-next-number-in-this-sequence-2-7-8-3-12-9

And a nonsense one. (It did promote comment)

May 8, 2014
#4
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0

Melody......Here's a problem that I ran into some time ago:

Show that

(1/2)*(3/4)*(5/6)*(7/8)*..............*(97/98) *(99/100) <  (1/10)

It's "tricky" ......but simple.......all at the same time.

Maybe some of the members  - or even, non-members - would like to try their hand at proving it !!

One word of warning.......your calculator won't do you any good on this one !!!

And ....as a "silly" problem...see if some of the users can figure THIS one out!!

Show that:    sinx / n  = 6

May 12, 2014
#5
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0

Monday  12/5/14

Interesting Physics question.

http://web2.0calc.com/questions/stuck-on-problem_1#r105221

May 12, 2014
#7
+106943
0
May 13, 2014
#8
+106943
0

Thurs 15th May

Who has heard of a minim before - not I

http://web2.0calc.com/questions/what-is-the-volume-of-the-pacific

New Puzzles posted by reinout-g   (Thanks reinout-g)

http://web2.0calc.com/questions/logic-s-puzzle#r105849

http://web2.0calc.com/questions/search/?q=white+collar+crime

Difficult factorisation and very impressive LaTex from Heureka

http://web2.0calc.com/questions/f-x-x3-4x2-x-6-which-is-the-factored-form-of-f-x

May 15, 2014
#9
+106532
0

Best "non-math" answer of the day  (IMHO) :

http://web2.0calc.com/questions/help-asap-i-have-a-question#r106014

May 15, 2014
#10
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0

Best "math" answer of the day:

alan's answer to this.....I didn't know this could be done......(at least, I've never seen it before!!)

http://web2.0calc.com/questions/f-x-x3-4x2-x-6-which-is-the-factored-form-of-f-x#r105911

I'm definitely adding that one to my repertoire !!!!

May 15, 2014
#11
+106943
0
May 15, 2014
#12
+106532
+11

Pizza Pie Problem: You and your two friends have purchased a pizza of radius "r" and you wish to divide it into three equal pieces by making vertial cuts similar to the ones shown below - obvously one of the cuts  is in the center.....when you find one more, you'll have the problem solved!!! (Note: The illustration indicates a radius of 3 , but the actual radius doesn't matter, since all circles are similar.)  The question is: Where should the cuts be made??

Your answer could be in terms of "r," or in terms of some angle "theta."  You might also consider letting the exact center of the pizza be (0,0).  Hint: The problem CAN  be solved with calculus, but trig will work, too - I've done it both ways - if I remember correctly. Also.......I believe you'll need a "solver" to "finish" your answer out......you will know when you have reached that point!!

Good luck!!

CPhill May 15, 2014
#13
+106943
0

Hi Chris,

Thanks for providing us with this challenge.

I would however like you to move it onto a new post in the body of the forum and put the green puzzle icon next to it.    It can then be referred in one of the puzzle threads.

An alternative would be to just put it straight into a puzzle thread in the first place.  I think that is what reinout-g has been doing.

You may like to talk to reinout about how he would like it done.  He is in charge of the puzzles.

Thanks, Melody.

P.S. I use this thread just to 'jot' down ideas and posts that I am likely to use in the 'End of Day Wrap'

It is just a bits and pieces thread.

May 16, 2014
#16
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Tuesday 20/5/14

Forum Interest Question - Web2.ocalculator

http://web2.0calc.com/questions/what-do-i-make-wrong

Cassdy1 asked a fraction question and from it CPhill proved that 1=∞

May 20, 2014
#18
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Thursday 22/5/14

Heureka explained a bit more LaTex.  I have been using it today and it works a treat!  Thanks Heureka.

http://web2.0calc.com/questions/5-11-2-x-1

Heureka also showed us that that the Web2 calculator has a MOD button.  I didn't know that!

http://web2.0calc.com/questions/how-do-i-do-mod-on-this-calc

I'd like someone knowledgeable to comment on the last post by "Someone Who Knows Everything".  Does it make sense?  It's all too much for me.  I liked my own answer.

http://web2.0calc.com/questions/if-there-were-3-skiers-on-plane-of-17-and-4-people-on-the-plane-died-of-a-crash-what-is-the-chance-that-all-3-skiers-survive

Bertie has posted a new proof of pythagoras' Theorum - It is woth the read!!! Thanks Bertie.

http://web2.0calc.com/questions/what-is-the-pythagoras-formula#r107415

The fun continued with this one

Funny one (at zegroes expense)

http://web2.0calc.com/questions/what-does-x-mean

Who was fibonacci?  (I thought I'd throw in one more serious one)

http://web2.0calc.com/questions/who-was-fibbanci

May 22, 2014
#19
+106943
+3

Friday 23/5/14

New Puzzle from reinout-g : Thanks reinout

http://web2.0calc.com/questions/probability-puzzles#r55

Higher level question - Answer curtesy of Alan.  Thanks Alan

http://web2.0calc.com/questions/arctanh-z-1-2-ln-1-z-1-z

More interesting setting out by Heureka.  Thanks Heureka

http://web2.0calc.com/questions/if-you-flip-a-fair-coin-nbsp-4-nbsp-times-what-is-the-probability-that-you-will-get-exactly-nbsp-2-nbsp-tails

Light Hearted Non-math fun (zegroes taught me what a Sayian is)

http://web2.0calc.com/questions/how-smart-is-the-website

May 23, 2014
#20
+106943
+3

Sat 23/5/14

Speed question - I think that they are always good value.

May 23, 2014
#22
+106943
0

mONDAY  6/5/14

Truncated Cube

http://web2.0calc.com/questions/what-is-the-volume-and-surface-area-of-a-truncated-cube

Two new words for me:  infimum and supremum

http://web2.0calc.com/questions/infimum-a-2-3

I haven't has time to think about it very hard but this probability question does sound interesting.

http://web2.0calc.com/questions/how-many-ways-can-n-books-be-placed-on-k-distinguishable-shelves-b-if-no-two-books-are-the-same-and-the-positions-of-the-books-on-the-shel

I really must work on my set notation.  Maybe someone could throw me some questions?

http://web2.0calc.com/questions/how-do-you-create-a-vertical-line-with-restrictions_1

May 26, 2014
#23
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0

Tues 27/5/14

Reinout has a star!

http://web2.0calc.com/questions/attn-reinout-g_1

Permutation locks!

http://web2.0calc.com/questions/if-a-combination-has-four-letters-and-four-numbers-what-is-the-probability-of-someone-guessing-the-combination

Reinout has been on a roll with the pictures. I just love reinout-g's pictures.

Though, today they have had a habit of going walk-about.  He has them on loan from Hogwarts, that is why!

http://web2.0calc.com/questions/3-x-4-6-2x-1

May 27, 2014
#24
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Wed 28/5/14

I had fun with this one.

http://web2.0calc.com/questions/hardest-math-question-ever

Rom's answer is interesting. I want to give it more thought.

This is the really silly one for the day.

http://web2.0calc.com/questions/the-lizard-illuminati

I haven't tried this one yet but it looks interesting.

http://web2.0calc.com/questions/help-needed_1#r0

May 28, 2014
#25
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0

Thurs 29/5/14

Reinout-g is cracking jokes again - So what is new?

http://web2.0calc.com/questions/how-to-solve-calculus

Zegroes is going into competition with Reinout

http://web2.0calc.com/questions/why-do-we-need-to-learn-math#rr1

Alan is a magician!

http://web2.0calc.com/questions/1-i-7

More fun with complex roots

http://web2.0calc.com/questions/fun-with-square#r0

I think middle level school people might find these 2 interesting.

http://web2.0calc.com/questions/if-bc-is-twice-as-long-as-ab-which-equations-would-let-you-find-the-length-of-ac

http://web2.0calc.com/questions/what-is-the-area-of-a-regular-octagon-whose-permineter-is-equal-to-72-cm-nbsp#r0

There is a "lizard illuminati" theme going through the forum at the moment.  This is the latest thread.

Scientology has also crept into the forum.  (It can stay so long as people don't voice offense)

http://web2.0calc.com/questions/xenu-the-overlord-is-returning-to-earth

May 29, 2014
#26
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Friday 30/5/14

Manipulating logs (Thanks for the demo Alan)

http://www.vividsydney.com/?gclid=CjgKEAjwtZucBRD77aiiq_v4xnASJABkAg8J9Q8SUW1uBhYGu8Gjcg_2K5fjvbH5CdTUw4aCXPz2oPD_BwE

Another complex number question

http://web2.0calc.com/questions/finding-the-fourth-root#r0

Just proves, there is a name for everything!   Ramanujan's number

http://web2.0calc.com/questions/is-12-cubes-1728#r2

Chilledz3non used this maths 'counting' video - it's long and it may be the weirdest maths clip I've ever seen - but it was kind of interesting. (And I thought a log was just a power)

Bertie's answer is interesting. Though I have no idea how he did a binomial expansion with a fractional index.

http://web2.0calc.com/questions/how-do-you-calculate-the-cube-root-without-calculator#r1

May 30, 2014
#27
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Sunday 1/6/14

Answerers must always remember that many/most people who use this forum have never heard of imaginary or complex numbers!  This poster has been trying to figure out our answer to this question for quite some time!

http://web2.0calc.com/questions/still-the-same-anon

Students can find equations with absolute signs quite tricky.

http://web2.0calc.com/questions/3y-6-3y-3

Back to basics with this one.

http://web2.0calc.com/questions/the-result-of-subtracting-a-negetive-integer-from-a-positive-integer-is-a-positve-integer

Interesting high level question

http://web2.0calc.com/questions/how-do-you-calculate-the-cube-root-without-calculator#r3

Jun 1, 2014
#29
+106943
0

Tues 2/6/14

Graphing trig functions.

http://web2.0calc.com/questions/graphing-trig-functions_1

Synthetic Division - I have always used long division , (that is what I was taught) but this is much simpler.

http://web2.0calc.com/questions/what-is-synthetic-division#r110179

Something higher lever (matrices)

http://web2.0calc.com/questions/is-this-the-right-way-to-do-this

Interesting!

http://web2.0calc.com/questions/cubes-and-cube-roots

Jun 2, 2014
#30
+106943
0

wednesday 4/6/14

#It appears that the curse of the unicorns is real!

http://web2.0calc.com/questions/unicorns-are-evil

#Lemniscate of Bernoulli curve - A new one for me.

2 foci, 2a units from one another where PF1 * PF2 = a2    Cool!

http://web2.0calc.com/questions/what-is-the-limit-on-the-online-scientific-calculator

Interesting motoring observation.

http://web2.0calc.com/questions/why-does-one-appear-to-be-slower

A bit of musical banter

http://web2.0calc.com/questions/1-fourth-divided-by-2-equals#r7

More clowning with half lives

http://web2.0calc.com/questions/how-do-you-work-out-half-life-problems#r0

Jun 3, 2014
#31
+106943
0

Thursday  and Friday 5&6 june2014

This one is interesting and important.  Please take note of what Bertie and I have said.  It is important that you are interactive with your learning.  Answerers do not want to feel like they are just doing someone's homework and that the only thing that the asker cares about is the answer!  We want to help people learn!  I also find the question itself very thought provoking.

VIVID

http://www.smh.com.au/entertainment/art-and-design/kraftwerk-kicks-off-vivid-sydney-with-a-display-for-the-senses-20130525-2n3ei.html

Jun 5, 2014
#32
+106943
0

Saturday 7/6/14

http://web2.0calc.com/questions/attn-registered-users#r8

Attitude - reminder and comedy.

http://web2.0calc.com/questions/need-help-asap_4#rr1

This one is still annoying me.

Jibberish.

http://web2.0calc.com/questions/what-is-2-plus-5-log-times-10000-4956-npr

Binomial expansion

http://web2.0calc.com/questions/use-the-binomial-theorem-to-expand-the-binomial-x-7y-3-and-simplyfy

I thought some people might be interested in how Chris and i answered this simple question.  We could have answered better but I think it is ok.

I liked this question - It needs to be checked.

http://web2.0calc.com/questions/from-cube-to-tetraedre

Square root in quehttp://web2.0calc.com/questions/from-cube-to-tetraedrestion verses Square root introduced in the working.

I have added the address of this one to the Sticky Thread called "Information worth keeping or Developing"

I thought it was excellent......
http://web2.0calc.com/questions/what-is-the-surface-are-of-a-cylinder-with-r-8-h-4#r2
A very nice explanation by NinjaDevo!!!......I'm gonna "steal" it for future reference...!!!

Jun 6, 2014
#33
+106943
+3

Sun 8/6/14

Talk about the German site and congratulate Radix for becoming a moderator.

Radix is moderator for the German site. he has never posted on our site.

This site runs forums in German, Spanish, French, English and Russian.
If you go to the bottom of any page you will see 5 two letter abbreviations. EN stands for English that is our version. DE stands for Deutsch which is German in German. Click on that and you will be transferred to the German site. That is where Radix hangs out. You will be logged out but you can log into the German site or you can came back here and log on again.

The fun continues.

http://web2.0calc.com/questions/what-is-the-derivative-of-a-constant

you tube clip discussing huge numbers - thanks Ninja Devo

http://web2.0calc.com/questions/what-is-the-biggest-number

Well, we are in a playful mood today! - Thread provided by jmanf726 - Thank you.

http://web2.0calc.com/questions/impossible_1

Trig substitution, asin verses sin-1 and Morgan Tud revisits us.

http://web2.0calc.com/questions/in-trinomial-2sin-2x-sinx-1-0-if-i-am-to-factor-it-with-sinx-u-shouldn-t-2sin-2x-become-something-else-rather-than-u-2-if-u-is-sinx-sh

Maybe i should include one fully serious one.  Thanks for the solution Problem.

http://web2.0calc.com/questions/how-do-you-factor-a-polynomial-that-has-2-variables#r2

Would anyone else like a language lesson?

http://web2.0calc.com/questions/differential-equations#r17

Jun 7, 2014
#36
+106943
0
Jun 10, 2014
#37
+106943
0
Jun 11, 2014
#38
+106943
0
Jun 12, 2014
#40
+106943
+3

Saturday 14/6/14

What is the value of pi

I have added this one's address to the sticky topic "Information pages worth keeping or developing"

http://web2.0calc.com/questions/what-is-the-value-of-pi

This might interest some people

http://web2.0calc.com/questions/cot-sin-1-2-3

I liked this one - a great answer from an anonymous person.

http://web2.0calc.com/questions/how-do-you-do-volume

I have started a sticky note infomratin thread for new people. (It is just a start)

http://web2.0calc.com/questions/information-for-new-people

Jun 14, 2014
#44
+106943
0

Wednesday 18/6/14

Pokemonfan58 has solved our number puzzle andposted a new one!

http://web2.0calc.com/questions/number-challenge-for-everyone-1#r112

Reinout has decided when need a Lunch box unwrap.  He appears to have his lunch VERY late in the day!

http://web2.0calc.com/questions/lunch-box-unwrap

I really like the 'proof' in this one - Thanks Reinout-g

http://web2.0calc.com/questions/begin-of-lunch-box-unwrap_2

There is some considerable disagreement happening here!

http://web2.0calc.com/questions/perpetuity_1

Relatively simple probability question

I haven't had a chance to look at these geometry questions but they do look interesting.

http://web2.0calc.com/questions/can-anyone-do-numers-8-and-10-and-14

limits

http://web2.0calc.com/questions/how-do-i-solve-this-limit-lim-x-0-2-x-x

Jun 18, 2014
#45
+106943
0
Jun 19, 2014
#47
+106943
0

Saturday and sunday 21/22 of June 2014

New version of "Information pages worth Keeping or Developing" Thank you NinjaDevo

http://web2.0calc.com/questions/information-pages-worth-keeping-or-developing_1

Whenever possible answers AND questions should be checked to make sure that they pass reasonableness checks.  Thank you Alan for reminding us of this.

http://web2.0calc.com/questions/how-can-i-find-the-area-of-a-polygon-if-diagonals-are-35-and-its-apothem-measures-10cm#r4

3 different method to exand double bracket problems.  I like Alan's method best but if I were teaching it in a class I would give a preamble on finding areas first and make sure the children could see the 'link'.

http://web2.0calc.com/questions/i-need-someone-to-explain-how-to-do-equations-like-this#r5

The fun definitely continues here.

Rosala has learned how to use memes and her squirrels are cute.  I also like the fact that although you and Zegroes have had some fun you have not given yourselves points for it.  I think points should mainly be kept for proper mathematics posts (answers) and just a few for the very best of the fun posts.

http://web2.0calc.com/questions/lets-end-the-day-with-a-lil-laugh

(You can never have too much maths humour!)   (Thank you reinout-g)

Jun 21, 2014
#48
+106943
0

Monday 23/6/14          ♬

Math Joke. (Courtesy of Anonymous)

http://web2.0calc.com/questions/math-joke-trigonometric-identities#r2

I liked what Chris did on this one.  I'll have to try and remember this technique.  Thanks Chris.

http://web2.0calc.com/questions/what-is-594750-9723

Jun 22, 2014
#49
+106943
0

Tuesday 24/6/14

This one is special.  Thank you Rosala.

http://web2.0calc.com/questions/lets-end-the-day-by-learning-something

How do we draw Euclidean Geometry Diagrams? (triangles, anges, hexagons etc)

http://web2.0calc.com/questions/what-is-geogebra

what can I say, I like the reindeer.

http://web2.0calc.com/questions/people-smell-better-than-reindeer-sven-don-t-you-think-i-m-right

This one is simple but unusual.  Jboy314 answered it well.

http://web2.0calc.com/questions/f-1-1-728-its-means

http://web2.0calc.com/questions/sorry-if-this-is-posted-twice

I like anonymous's contribution to this question - I hadn't thought about that before.

http://web2.0calc.com/questions/what-does-this-round-too-2-8974

Remainder Theorum.  I think I did a good job on this one but I'd like another mathematician to go over it carefully please and find any mistakes, poor wording etc. (I want to keep it for reference)

This one sparked a lot of high level interest.  Polynomial Factorisation.

http://web2.0calc.com/questions/polynomial_2

2 watery puzzles (I added them to "Puzzles")

http://web2.0calc.com/questions/tap-a-can-fill-up-an-empty-tank-in-3-hours-tap-b-can-fill-up-the-same-empty-tank-in-4-hours-tap-c-can-fill-up-the-same-empty-tank-in-6-hours

http://web2.0calc.com/questions/an-empty-tank-has-a-capacity-of-55-2-litres-water-flows-from-a-tap-a-at-3-6-litres-per-mimute-and-2-4-litres-per-minute-from-a-tap-b-tap-a-w

A bit of witty repartee.  (I don't know what other kind of repartee that there is.)

http://web2.0calc.com/questions/how-do-you-convert-a-fat-percentage-into-grams

♬                                        ♬ ♬ MELODY ♬ ♬

Jun 24, 2014
#50
+106943
0

Wed 25/6/14

♬                                        ♬ ♬ MELODY ♬ ♬

Look at the attention you can get if you wait for US summer holidays!

http://web2.0calc.com/questions/algebra-i-question

I must try and find time to examine this one! (thanks jboy314, Alan and Heureka)

http://web2.0calc.com/questions/help-with-a-trig-sub

Jun 25, 2014
#51
+106943
0

Thursday 26/6/14

♬                                        ♬ ♬ MELODY ♬ ♬

I thought this one was interesting.

http://web2.0calc.com/questions/how-is-the-graph-of-y-x-2-2-transformed-to-make-the-graph-of-y-x-2

Modula Arithmetic and an equation (Thanks Alan and Heureka)

http://web2.0calc.com/questions/3-d-mod-1288-1

Another equation.

http://web2.0calc.com/questions/how-to-solve-this-equation

Dividing by zero.  Still room for another comment.

http://web2.0calc.com/questions/what-happens-when-you-divide-by-zero#rr6

A couple of word an notational definitions (Thanks Alan)

http://web2.0calc.com/questions/assume-that-f-is-a-one-to-one-function

Playing with inverse functions (Thanks jboy314)

http://web2.0calc.com/questions/use-the-inverse-function-property-to-determine-whether-nbsp-f-nbsp-and-nbsp-g-nbsp-are-inverses-of-each-other

Jun 25, 2014
#52
+106943
0

Friday 27/6/14

♬                                        ♬ ♬ MELODY ♬ ♬

Is 0 even or odd? (Thanks CPhill and NinjaDevo)

http://web2.0calc.com/questions/is-0-odd-or-even

This one shows how you can solve a problem algebraically and graphically.(Thanks jboy314, Melody)

http://web2.0calc.com/questions/solve-the-nonlinear-inequality

Rosala's -Let's end the day with a laugh - rather self-explanatory I would think. lol.

http://web2.0calc.com/questions/lets-end-the-day-with-a-laugh

Looking at domain and range for exponential functions. (CPhill and Melody)

http://web2.0calc.com/questions/would-i-be-able-to-get-the-domainand-range-from-a-function-or-does-it-have-to-be-from-a-graph

This probability question created some interest.

There have been a few simultaneous quadratic equation questions about. Here is one of them.

http://web2.0calc.com/questions/find-the-total-cost-of-producing-6-widgets

Jun 26, 2014
#54
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Tues 30/6/14

♬                                        ♬ ♬ MELODY ♬ ♬

Reinout is back - Lunch box unwrap.

http://web2.0calc.com/questions/begin-of-lunch-box-unwrap_6

Rosala's first day back at school.

http://web2.0calc.com/questions/bye-bye

You want some WOW factor?  Thanks Morgan Tud

Boolean Logic.  Words can be difficult to interprete.  Alan and I had problems here. lol

http://web2.0calc.com/questions/if-a-true-b-false-c-true-then-a-and-b-and-c

This is a good question if you are wanting to become comfortable with powers. Thanks jboy314

http://web2.0calc.com/questions/if-4-x-5-2-3x-1-then-what-is-x

This looks interesting.   Thanks Alan

http://web2.0calc.com/questions/rewrite-this-formula

Some interesting ideas here.

An interesting Puzzle - I have added it to the "Puzzles" sticky note

Jun 30, 2014
#55
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Wed/Thursday 1/7/14

♬                                        ♬ ♬ MELODY ♬ ♬

Rose98 only just joined and look at the introduction that she gets.  No one even attempted to help her. ROFLOL.  Welcome to web2.0 forum Rose98.  I really do hope that you learn lots as well as have fun here!

http://web2.0calc.com/questions/i-don-t-understand-ratios

Rosala's Post.

http://web2.0calc.com/questions/lets-end-the-day-with-a-laugh_1

Some probability to get us started

http://web2.0calc.com/questions/airlines-often-sell-more-tickets-for-a-flight-than-there-are-seats-because-some-ticket-holders-do-not-show-up-for-the-flight-assume-that-an#rr2

Formulas look different, answers are the same.

http://web2.0calc.com/questions/what-would-be-the-monthly-payment-for-20-000-at-6-9-financing-for-60-months

Advanced statistics if anyone is interested.

http://web2.0calc.com/questions/poisson

This one looks interesting - Given time I will take a much better look!

http://web2.0calc.com/questions/intergration-of-x-to-the-minus-one

Another I would like to look at properly.

Distance formula

http://web2.0calc.com/questions/what-is-the-distance-between-2-5-and-3-0

This is a bit of fun - maybe we could have some more solutions.  Thanks anonymous.

http://web2.0calc.com/questions/same-question-as-below

This is a good question for our younger members.

http://web2.0calc.com/questions/reena-spends-rs-9800-every-month-from-her-salary-and-the-remaining-amount-she-deposits-in-abank-if-she-deposits-30-what-is-her-salary

I haven't finished with this one yet. I am quite sure all our answers are wrong.  I have an idea but I haven't had time to work through it yet.

http://web2.0calc.com/questions/a-keycode-must-contain-4-letters-and-3-numbers-the-letters-may-be-any-letter-of-the-alphabet-the-numbers-should-be-any-number-from-0-to-5

Jul 1, 2014
#56
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Fri/Sat 5/7/14

♬                                        ♬ ♬ MELODY ♬ ♬

Sum and product of quadratic roots

http://web2.0calc.com/questions/if-r-and-s-are-the-roots-of-2x-2-5x-7-0-what-is-the-value-of-r-s-s-r

Weekend at last from Rosala

http://web2.0calc.com/questions/weekend-at-last

Word poroblems are good - thanks Kitty<3

http://web2.0calc.com/questions/a-47-foot-long-piece-of-pipe-is-to-be-cut-into-three-pieces-the-second-piece-is-three-times-as-long-as-the-first-piece-and-the-third-piece

This one puzzles me a little.

http://web2.0calc.com/questions/write-the-equation-of-a-hyperbola-with-vertices-at-4-0-and-4-0-and-covertices-at-0-5-and-0-5

Holiday Entertainment  (thanks Ninja)

http://web2.0calc.com/questions/math-stumpers

I learned something here. Thank you Chris and Alan.

http://web2.0calc.com/questions/write-the-equation-of-a-hyperbola-with-vertices-at-4-0-and-4-0-and-covertices-at-0-5-and-0-5

An interesting motion question done by physics formulae and by calculus.

http://web2.0calc.com/questions/word-problem_8

Another question answered via 2 different approaches.

http://web2.0calc.com/questions/the-sum-of-three-consecutive-even-integers-is-108-what-is-the-largest-number

Vectors - velocity

http://web2.0calc.com/questions/consider-a-particle-with-initial-velocity-v-that-has-magnitude-12-0-m-s-and-is-directed-60-0-degrees-above-the-negative-x-axis-what-is-the

Lunch box unwrapped : Reinout-g

http://web2.0calc.com/questions/begin-of-lunch-box-unwrap_7

And, last but not least the saga continues - I'd really like some input on my last entry.  Thanks.

http://web2.0calc.com/questions/a-keycode-must-contain-4-letters-and-3-numbers-the-letters-may-be-any-letter-of-the-alphabet-the-numbers-should-be-any-number-from-0-to-5

Jul 5, 2014
#57
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Sun  6/7/14

♬                                        ♬ ♬ MELODY ♬ ♬

Ninja's recommendation for number lines etc (I must download and play with this)

http://www.getpaint.net/index.html

A little calculus in motion problem.

http://web2.0calc.com/questions/velcro-b***s

Let's end the day with a laugh.

http://web2.0calc.com/questions/lets-end-the-day-with-a-laugh_2

Now Zegroes take.

http://web2.0calc.com/questions/the-reality-of-rosalas-poem#r1

Jul 5, 2014
#58
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Mon 7/7/14

♬                                        ♬ ♬ MELODY ♬ ♬

Grizzly Bear land mines. (SevenUp)

http://web2.0calc.com/questions/grizzly-bears#r24

I always like these questions.

I think some of the younger ones may learn a lot from these;

http://web2.0calc.com/questions/convert-the-following-angles-to-degrees-minutes-and-seconds-0-4-and-1-6

http://web2.0calc.com/questions/if-the-vertex-angle-of-an-isosceles-triangle-has-a-measure-of-60-and-the-length-of-each-leg-is-18-find-the-length-of-the-altitude-drawn-to

http://web2.0calc.com/questions/an-apple-cost-3x-6-pesos-while-an-orange-cost-4x-5-pesos-what-is-the-total-cost-of-1-dozen-apples-and-half-dozen-of-orange

http://web2.0calc.com/questions/perimeter_1

This little problem created some interest.

http://web2.0calc.com/questions/a-problem-what-is-2-2014-2-2013-found-at-brilliant-org-problem-solving-site

http://web2.0calc.com/questions/which-expression-can-be-used-to-represent-the-number-of-strawberries-on-5-tables

I have no idea but it looks like more of an answer is desired.

http://web2.0calc.com/questions/writing-sech-inverse-4-5-sech-inverse-5-13-in-natural-logarithim-using-formula-sech-inverse-x-ln-1-sqrt-1-x-2-x

I am glad we have Alan to help us.

http://web2.0calc.com/questions/suppose-i-have-a-set-0-1-2-x-1

http://web2.0calc.com/questions/find-the-equation-of-the-locus-of-points-represented-by-complex-number-z-when-w-is-real

Spot the fallacy:

http://web2.0calc.com/questions/step-1-let-a-b

I liked the humour in these ones:

http://web2.0calc.com/questions/how-to-find-tax

http://web2.0calc.com/questions/why-is-2-10-and-2-11-the-same-thing

Jul 8, 2014
#59
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Fri 11/7/14

♬                                        ♬ ♬ MELODY ♬ ♬

1) Rosala's post just has to go first.  Thank you for sharing all this with us.

http://web2.0calc.com/questions/lets-end-the-day-with-a-laugh_3

2) This post gave me a really good laugh. Thanks DragonSlayer554

http://web2.0calc.com/questions/dragonslayer554-s-oppinion

3) I think our younger members better check this question.  Many of you attempted it but I don't think any of you got it correct.  Then again it could be me that got it wrong.  That would be rather embarasing.

http://web2.0calc.com/questions/9-5-3z-8k-use-k-2-and-z-6_1

4) This is a good one for our younger students to think about.  Don't look at the answer straight away!

http://web2.0calc.com/questions/what-is-x-in-x-7-2                (thanks Chris)

5) Really nice examples of Algebraic substitution in Quadratic equations. (Thanks Heureka)

http://web2.0calc.com/questions/solve-the-equation_1

6) Using logs to solve equations

http://web2.0calc.com/questions/find-the-solution-of-the-exponential-equation

7) Interesting point on log domains.

http://web2.0calc.com/questions/use-the-laws-of-logarithms-to-combine-the-expression

8) Finding the centre and the radius of a circle, using the equation.

9) Interesting problem for the younger ones and great graphics from Ninja - thank you.

http://web2.0calc.com/questions/the-minute-hand-on-a-watch-is-1-5cm-long-what-distance-does-the-tip-of-this-hand-travel-through-in-1-hour

10) Why do 2 neg multiply to a positive.  I really liked Chris's explanation.  Thanks Chris.

http://web2.0calc.com/questions/want-to-multiply-2-negatives

11) New terms for me.  Thanks Ninja.

http://web2.0calc.com/questions/tell-if-inconsistent-or-dependent

12) Using modular arithmetic and Web2.0calc to find a remainder. Thanks Alan.

http://web2.0calc.com/questions/132-28-19-what-is-the-remainder

13) A good problem one if you want to give it a go.

14) A really good question for the younger students

Jul 10, 2014
#60
+106943
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Fri 11/7/14

♬                                        ♬ ♬ MELODY ♬ ♬

I really was not impressed with this thread this morning.  A new member, Mari379, asked a serious question.

Rosala welcomed her to the forum, that was nice, thank you Rosala.

Then Zegroes, Rosala and DragonSlayer turned the thread into a fun post.  Yes it was funny, that is why I didn't just white it out but by the time sevenUP answered the actual question.  The serious answer was lost amounst the sea of detritus.  A couple of hours later, Mari reposted and CPhill anwered.  She should have been able to see her answer in the first place.  You should all be a little bit ashamed of yourselves.

You know I don't mind you playing on the forum.  In fact I really like it.  BUT do not do on serious posts.  Especially when they  are not fully answered yet!

http://web2.0calc.com/questions/is-it-possible-to-get-873-from-100-75-50-25-10-6

This one inspired some thought.

http://web2.0calc.com/questions/how-do-i-figure-out-the-right-of-a-triangle-when-ab-equals-13-and-cb-equals-12

This one proved to be a bit controversial.

http://web2.0calc.com/questions/how-do-i-simplify-10-000e-2-835#r14

I liked this question. Thanks Rose98 and Chris

http://web2.0calc.com/questions/so-i-have-two-triangles-here-but-are-they-overlapping-i-can-t-draw-i-diagram-that-fits-the-discription-p-nbsp-does-anyone-have-a-suges

This is an old (missed) one but I only just did it (part A anyway) I like these types of questions.

http://web2.0calc.com/questions/find-the-domain-of-the-function_2

Radioactive decay question.  (Ninja, could you put this aside as a log sample question please)

Jul 13, 2014
#61
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Jul 13, 2014
#62
+106943
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Wed 16/7/14

♬                                        ♬ ♬ MELODY ♬ ♬

Forces (thanks Alan)

http://web2.0calc.com/questions/2d-forces-equation#r0

http://web2.0calc.com/questions/finding-friction-coefficient-from-kinetic-energy

Bricks in a wall. (Thanks Kitty and Ninja)

Understanding the notation is key. (Thanks Alan)

http://web2.0calc.com/questions/finding-un-in-terms-of-n

Braking distance in relation to speed. (Thanks sevenUP and NinjaDevo)

http://web2.0calc.com/questions/braking-distance-math-problem

Jul 15, 2014
#63
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Thurs 17/7/14

♬                                        ♬ ♬ MELODY ♬ ♬

We'll start with a riddle for the "rat pack" I am told that this is what CPhill calls the children of the forum!  Thanks awesomenes

The heading says it all - Thanks Alan

http://web2.0calc.com/questions/difficult-logarithmic-equation-without-a-calculator

DragonSlayer had some problems with this one.

http://web2.0calc.com/questions/what-is-0-04-12-equal

Trig identity (Thanks Kitty<3)

http://web2.0calc.com/questions/verify-the-identity-cot-theta-sec-theta-csc-theta

http://web2.0calc.com/questions/5a-5-5a-5

Here is something for the younger ones that is just a little unusual

Jul 16, 2014
#64
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Fri 18/7/14

♬                                        ♬ ♬ MELODY ♬ ♬

Middle high students could find this interesting (Thanks NinjaDevo)

http://web2.0calc.com/questions/a-spherical-ball-hss-a-diameter-of-45cm-workout-the-volume-of-the-ball

This is a niftey little technique that I learned of CPhill and Alan.

Difficult log - Mine is the longest but not the best (Thanks Chris and Alan)

http://web2.0calc.com/questions/difficult-logarithmic-equation-without-a-calculator

What is a logarithm.  (Thanks anonymous) someone may like to add to this one.

http://www.mathsisfun.com/algebra/logarithms.html

Distance, time and speed problem. (Thanks Alan)

http://web2.0calc.com/questions/distance-time-speed-problem-i-m-having-trouble-with#rr2

Time by hand and on a calculator.

http://web2.0calc.com/questions/what-is-21hours-and-58-minutes-subtracted-by-4-36-p-m-equal

An interesting trig equation.

http://web2.0calc.com/questions/8-sec2-x-4-tan2-x-12-0

Jul 17, 2014
#65
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Sat 19/7/14

♬                                        ♬ ♬ MELODY ♬ ♬

1)  This higher level one looks interesting. (Thanks Alan)

Jul 18, 2014
#66
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Sun 20/7/14

♬                                        ♬ ♬ MELODY ♬ ♬

1) Rosala's Wrap - Thanks Rosala, we really enjoy these. I love the Goa waterfall! And the fun pics as well!

http://web2.0calc.com/questions/lets-end-the-day-with-a-laugh_5#r3

2) Calculus - Interesting problem which uses the chain rule.

3) Thankyou Rosala

http://web2.0calc.com/questions/is-their-another-forum-like-this

Jul 19, 2014
#67
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Tues 22/7/14

♬                                        ♬ ♬ MELODY ♬ ♬

1) Let's end the day with Wonders.  Says it all, dosen't it.  Thanks Rosala.

http://web2.0calc.com/questions/lets-end-the-day-with-wonders

2) Average variation.   Thansk Ninja

http://web2.0calc.com/questions/the-average-of-six-numbers-is-6-if-3-is-subtracted-from-each-of-four-of-the-numbers-what-is-the-new-average

3) When it comes to probability related questions I am one of the 3 stooges. I always knew I had a funny side!

http://web2.0calc.com/questions/nbsp-in-how-many-ways-can-five-married-couples-be-seated-around-a-circle-so-that-spouses-sit-together-nbsp

4) Lateral thinking needed and great Latex too.  Thanks Heureka

http://web2.0calc.com/questions/5x-8-3x-3-whats-the-x

5) Chris has asked for further input on this one but I havn't gotten up to it yet.  Maybe someone else would like to comment?

Jul 21, 2014
#68
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Wed 23/7/14

♬                                        ♬ ♬ MELODY ♬ ♬

Unusual Trig (Thanks Heureka and T-rex)

http://web2.0calc.com/questions/cos-a-b-sin-a-3-5-sin-b-5-13-a-b-in-q3

0.9 repeater

http://web2.0calc.com/questions/0-99999

Determining the sequence.  Thanks T-rex and Heurela)

http://web2.0calc.com/questions/if-1-2-2-10-3-30-4-68-then-5

Jul 22, 2014
#69
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♬                                        ♬ ♬ MELODY ♬ ♬

An explanations of some of my attitudes.

http://web2.0calc.com/questions/how-do-you-get-points

Here Alan has employed the Taylor Series to evaluate a limit (actually, to find a derivative)

Thanks Alan and thank you Chris for recmemding this thread.

http://web2.0calc.com/questions/what-is-the-derivative-of-y-4sqrt-x-using-the-first-principle

This looks interesting - Pretty picture too.  Thanks Alan.

http://web2.0calc.com/questions/if-a-light-ray-is-incident-of-the-glass-surface-with-index-of-refraction-n-1-50-at-0-degree-anglee-what-would-be-the-angle-of-refraction-if

Lets end the day with a laugh.  That is a great idea Rosala.  Thank you.

http://web2.0calc.com/questions/lets-end-the-day-with-a-laugh_6

Jul 23, 2014
#70
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Fri 25/7/14

♬                                        ♬ ♬ MELODY ♬ ♬

Ninja has completed his first draft of 'Great Answers to Learn From' and he is looking for comments and input from other members.

You may want to suggest that another thread be included.

You may want to suggest that a thread be moved from where Ninja has put it to somewhere else. Remember, Ninja has not done a lot of these topics so it is possible that some things are not in the best places.

You may have something else on your mind that I have not thought of.

I am very pleased with the thread that Ninja has put together.  It is very nicely presented and over the course of time I feel sure that it will be well used.

Ninja, On behalf of web2.0 forum I offer you a very big thank you.  Rosala might have some roses for you if you are really lucky.

----------------------------------------------------

This is an interesting little question. Thanks Alan

http://web2.0calc.com/questions/1-sqrt-3-2-sqrt-3-1-why

Jul 24, 2014
#71
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Sat 26/7/14

♬                                        ♬ ♬ MELODY ♬ ♬

Rosala's Contribution - Always a crowd pleaser

web2.0calc.com/questions/last-laugh

http://web2.0calc.com/questions/last-laugh

Using Heron's formula to find the area of a triangle. Thanks Alan.

http://web2.0calc.com/questions/triangle-s-sides-are-a-5-b-12-and-c-9-what-is-the-area-of-the-triangle

I found this interesting.  Thanks Alan.

http://web2.0calc.com/questions/what-is-the-rotation-of-90degree

I turned this one into a saga. lol

http://web2.0calc.com/questions/plz-solve-this-questions

Jul 25, 2014
#73
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Mon 28/7/14

Bye Bye from Roasala - Have fun, we'll see you in a week or so.

http://web2.0calc.com/questions/bye-bye-see-you-all-next-week

♬                                        ♬ ♬ MELODY ♬ ♬                           ♫♪ You light up my life ♪ ♫

Jul 27, 2014
#76
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Thurs 31/7/14

Some members were playing with LaTex.  there is a question waiting for DragonSlayer to answer.

http://web2.0calc.com/questions/here-is-a-question-just-for-latex-beginners-like-draagonslayer#rr10

Difficult inequality solution.   Ninja I think this one would be good in your new thread.

http://web2.0calc.com/questions/how-can-i-solve-the-first-question-nbsp

This was included yester day I think but the discussion continued today.

http://web2.0calc.com/questions/the-difference-between-twice-a-number-and-8-is-twenty-more-than-nine-times-the-number-find-the-number

I thought I would put this one in because it is so beautifully presented.   Thanks Ninja

http://web2.0calc.com/questions/3x60-5x9-2x2

A top little puzzle. Thanks for the answer Aziz.

http://web2.0calc.com/questions/clue-for-a-riddle

♬                                        ♬ ♬ MELODY ♬ ♬                           ♫♪ You light up my life ♪ ♫

Jul 30, 2014
#77
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Fri 2/8/14  Some of these would make really nice additions to your 'Great questions to learn from' thread Ninja.

I'll try and categorise them for you.

Working with logatithms. Hard one.

http://web2.0calc.com/questions/log-3-6-log-9-6-log-4-6-log-18-6

Another good sample question - A relatively easy on this time.

http://web2.0calc.com/questions/is-8-200-5-300

There were a lot of vector questions today - Here is one of them. (Physics)

http://web2.0calc.com/questions/u-6i-j-and-v-10i-j-find-the-manitude-of-u-v

Finding real and complex roots

http://web2.0calc.com/questions/find-all-the-complex-cube-roots-of-z-8-write-each-root-in-rectangular-form

Trigonometry

http://web2.0calc.com/questions/rewrite-the-trig-expression-assume-u-gt-0-and-the-value-of-the-inner-inverse-trig-expression-0-lt-theta-lt-pi-2

I quite liked DragonSlayers question.   Apparent brightness of stars.

♬                                        ♬ ♬ MELODY ♬ ♬                           ♫♪ You light up my life ♪ ♫

Jul 31, 2014
#78
+106943
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Sat 2/8/13

A treason plot has been uncovered!

http://web2.0calc.com/questions/what-is-an-absolute-value

What does Sigma ∑ mean?

Trick question - sometimes you have to be careful. lol

http://web2.0calc.com/questions/30-divided-by-half

LaTex lesson

http://web2.0calc.com/questions/10x-2-12-8x

I always use the units to solve rates problems.

♬                                        ♬ ♬ MELODY ♬ ♬                           ♫♪ You light up my life ♪ ♫

Aug 1, 2014
#80
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Monday 4/8/14

A little LaTex lesson

http://web2.0calc.com/questions/latex#r32

It's John Venn's birthday!

Using degrees minutes and seconds with the web2 calc.

Ninja I would like this included in one of our pages somewhere.  Do we have something somewhere on how to use the web2 calc efficiently?

http://web2.0calc.com/questions/hey-i-need-to-find-a-side-of-a-triangle-but-the-angle-is-using-degrees-minutes-seconds-and-your-calculator-does-not-do-them

Another than ND has already entered into our reference material     Thanks Chris.

http://web2.0calc.com/questions/dividing-whole-numbers-by-fractions

Trigonometry - determining ratio of sides when angles of the triangle are know. (I'd like this in sample questions please Ninja)

♬                                        ♬ ♬ MELODY ♬ ♬                           ♫♪ You light up my life ♪ ♫

Aug 3, 2014
#81
+106943
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Tuesday 5/8/14

What is a Venn diagram

http://web2.0calc.com/questions/there-are-28-people-in-our-math-class

Rationalising a denominator

http://web2.0calc.com/questions/in-question-21-nbsp

I think that I have got it.     Thanks Alan.

http://web2.0calc.com/questions/find-the-average-slope

Number puzzles

http://web2.0calc.com/questions/here-is-a-number-puzzle-for-you-nbsp-it-s-a-tough-one

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Aug 4, 2014
#82
+106943
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Wed 6/8/14

How to remember pemdas.

http://web2.0calc.com/questions/is-there-a-way-to-remember-pemdas

*Equations with fractions.

http://web2.0calc.com/questions/if-then

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Aug 5, 2014
#83
+106943
0

Thurs 7/8/14

What is n to the power of infinity

http://web2.0calc.com/questions/what-is-n-to-raise-power-infinity

* Compare Renting to Buying - Annuities

Note to Ninja: This will go under a general heading of 'Commercial Mathematics', and a sub heading, 'Seniors' , or 'Difficult' or something similar please.

http://web2.0calc.com/questions/need-done-if-possible

*? Word problem  (Thanks Alan)

http://web2.0calc.com/questions/i-have-a-bale-of-hay-that-is-5-in-diameter-and-4-wide-if-i-store-T

This one may be worthy of consideration. Graphing sum of absolutes.

http://web2.0calc.com/questions/graph-of-y-x-1-2-x-3

You may well ask - what the heck is a Klein bottle?

http://web2.0calc.com/questions/klein-bottle-volume

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Aug 6, 2014
#84
+106943
0

Sat 9/8/14

(1) Rosala's back

http://web2.0calc.com/questions/lets-end-the-day-with-a-laugh_7

(2) I don't know what Llamas have to do with it but it is a cute pic.

http://web2.0calc.com/questions/ily-all-of-u-btw-whats-is-9-5-17-happy-birthday-llamas-year-of-llamas

(3)  A little LaTex lesson (I have already refernce this in the LaTex thread  )

http://web2.0calc.com/questions/peter-has-12-marbles-he-gives-3-to-tom-and-5-to-lily-how-many-does-marbled-does-he-have-left#r2

(4) * Finding the equation of a polynomial when you are given the roots.

(5) * Simplifying a difference of 2 squares.

(6) * Why is Sinθ approximately equal to θ for very small values θ

http://web2.0calc.com/questions/why-is-sin-of-theta-appromately-equal-to-theta

(7) * Solving differential equations (This would go under calculus)

(8) * Percentage - Find a total when given a part.

(9)* I want this one in the Reference Material thread please Ninja.

How do you choose the correct trigonometric ratio (sin, cos or tan) to use?

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Aug 8, 2014
#85
+106943
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Sun 10-8-14

* Complicated 'quadratic' equation - extension question, for interest only.

* What is a geometric mean?  (Note to Ninja: Maybe just under arithmetic?)

http://web2.0calc.com/questions/i-am-trying-to-find-the-geometric-mean-for-the-values-110-50-80-120-90

Another of Alan's 'specials' (Ninja: You can put it in extension algebra if you want, you decide)

http://web2.0calc.com/questions/1-3-2-3-3-3-4-3-5-3-2014-3#r4

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Aug 9, 2014
#86
+106943
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Mon 11/8/14

Interesting little 3D/algebra question.

*Word Problem - Really hard, simultaneous equations (Thanks Chris)

http://web2.0calc.com/questions/a-shopkeeper-paid-9-380-for-some-shirts-and-jeans-he-bought-4-times-as-many-shirts-as-jeans-each-pair-of-jeans-cost-40-more-than-a-shirt-h

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Aug 10, 2014
#88
+106943
0

Wed 13/8/14

Some fun here.

http://web2.0calc.com/questions/what-is-sin_2

Simultaneous Eauations - Word  problem    (thanks Chris)

http://web2.0calc.com/questions/alex-bought-some-cherries-at-5-per-pound-and-some-oranges-at-2-per-pound-if-he-paid-18-for-the-cherries-and-oranges-combined-and-if-the

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Aug 12, 2014
#89
+106943
0

Thurs 14/8/14

What to do to combat pop-ups

http://web2.0calc.com/questions/non-math-help

* Statistics - Z scores

http://web2.0calc.com/questions/how-do-i-find-the-area-under-the-standard-normal-curve-over-the-interval-specified-below-between-z-44-and-z-44

* Introductory Algebra

http://web2.0calc.com/questions/5x-21-2x-what-does-x-mean

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Aug 13, 2014
#90
+106943
0

Tues 19/8/14

Lets end the day with a laugh - Thanks Rosala

http://web2.0calc.com/questions/lets-end-the-day-with-a-laugh_9

Matrices and the web2 calc.

http://web2.0calc.com/questions/how-do-i-calculate-the-inverse-of-a-matrix-using-the-sc#r0

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Aug 18, 2014
#91
+106943
0

Thurs 21/8/14

* Woking with speed (This is a rates question Ninja)

CPhill recommended this question.  It is an interesting one.

http://web2.0calc.com/questions/a-migrating-elephant-herd-started-moving-at-a-rate-of-6-miles-per-hour-one-elephant-stood-still-and-was-left-behind-then-this-stray-elepha#r1

* Vectors

* Finding an angle using trigonometry.

* Unusual Trigonometry Equation (easy)

*Introduction to imaginary numbers

http://web2.0calc.com/questions/is-3i-a-whole-number-a-natural-number-an-integer-or-something-else

Remember if anyone ever want to recommend a thread to be included her just private message me the address. I would be very pleased to receive it.

♬                                        ♬ ♬ MELODY ♬ ♬                           ♫♪ You light up my life ♪ ♫

Aug 20, 2014
#92
+106943
0

Fri 22/8/14

* 1) Bearings with Vectors (Trigonometry or vectors)

* 2) Something interesting for the youngsters (Arithmetic)

* 3) Unusual Calculus/cordinate geometry question.

I didn't understand the question till I saw Chris's solution.     Thanks Chris.

http://web2.0calc.com/questions/find-the-most-left-and-right-tangent

* 4) Permutations where some objects are not unique

http://web2.0calc.com/questions/permutations_2

♬                                        ♬ ♬ MELODY ♬ ♬                           ♫♪ You light up my life ♪ ♫

Aug 21, 2014
#93
+106943
0

Sat 23-8-14

* 1) Why is  $$-3^2=-9\;\; not\;\; +9?$$       (Great answer from Ninja)

* 2) Box and Whisters plot (Statistics)

http://web2.0calc.com/questions/algebra-2_85

* 3) Introduction to algebra

* 4) Introductory set theory

* 5) Some advanced calculus (Thanks Alan)

* 6) Thinking Puzzle question - I want to think about this one some more! Thanks Chris

http://web2.0calc.com/questions/prove-that-in-a-gathering-of-n-persons-there-is-always-2-persones-of-them-that-have-same-amount-of-friends-among-these-persones

7) Speed question.  These always make you think.

* 8) An easy speed question but a good one.

http://web2.0calc.com/questions/a-boat-on-a-river-travels-20-miles-downstream-in-only-2-hours-it-takes-the-same-boat-6-hours-to-travel-12-miles-upstream-what-are-the-spee

* 9) Complex number proof   $$i^i$$ is a real number.

http://web2.0calc.com/questions/puzzle-question-i-i

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Aug 22, 2014
#94
+106943
0

Mon 25/8/14

* 1) Using the web 2 calc for unit conversions. MAYBE this could go in reference material.  What do you think Ninja.

http://web2.0calc.com/questions/1505-91-convert-unit-of-measurement

* 2) Changing radians to degrees

* 3) Uni level Trigonometry

http://web2.0calc.com/questions/how-to-know-when-the-function-is-continuous

* 4) High level Trig

http://web2.0calc.com/questions/how-can-i-show-that-the-bound-between-sin-v-2-cos-v-2-1-is-true-for-all-degrees-in-the-intervall-0-v-180

* 5) Is zero even or odd?

* 6) Directed numbers and plotting on a number line. An excellent answer from Ninja.

7) I think this one was included yesterday but Heureka has added to it.  (with cosh and sinh)

http://web2.0calc.com/questions/e-x-e-x-2-2-1

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Aug 24, 2014
#95
+106943
0

Tues 26/8/14

*1) Ninja has been writing a lot of very good posts pertaining to using the web2 calculator.  I think that these need to be kept.  They are very good.   this is an example of 1

http://web2.0calc.com/questions/how-do-you-do-an-absolute-value

2) A bit of fun here

http://web2.0calc.com/questions/write-a-word-phrase-that-can-be-represented-by-m-25

* 3) Trig question - I liked it!

http://web2.0calc.com/questions/3cosx-4sinx-1

* 4) People always need to practice simultaneous equations

6) I am not sure what this one means - maybe you can work it out

http://web2.0calc.com/questions/how-do-you-make-1-3-using-only-the-digits-1-2-3-4-5-6-7-8-9-in-a-division-equation

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Aug 25, 2014
#96
+106943
0

Wed 27/8/14

* 1) I thought this quadratic equation was just a little different from usual

http://web2.0calc.com/questions/x-7sqrt-x-10-0

* 2) Finding a root of a negative number.

* 3) Vectors.  (thanks Chris)

4) Comic relief for mathematicians.  Despite the heading this is quadratics NOT trigonometry.

http://web2.0calc.com/questions/trigonometry_78

* 5) Anyone fancy some physics?

I am sorry, I should have included other people's physics answers in the past. I don't usually understand it. That is my excuse and my apology in one.

http://web2.0calc.com/questions/nbsp_3

* 6) logs - 2 differerent approaches

http://web2.0calc.com/questions/why-does-log-2ab-log-5-a-log10b-0

♬                                        ♬ ♬ MELODY ♬ ♬                           ♫♪ You light up my life ♪ ♫

Aug 26, 2014
#97
+106943
0

Thurs 28/8/14

An interesting function query.

http://web2.0calc.com/questions/pre-calc-functions

Rosala's laugh

http://web2.0calc.com/questions/let-s-end-the-day-with-a-laugh

A good one for the younger crowd

http://web2.0calc.com/questions/for-all-possible-values-of-a-if-a-b-2-a-2-what-must-b-equal

I like doing things the long way lol

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Aug 27, 2014
#98
+106943
0

Fri 29/8/14

1) Ninja presents his full answers beautifully - just look at this equation solution !!

http://web2.0calc.com/questions/8-x-1-4x-8

* 2) Today Aziz suggested this "Learning Calculus" website.  People should never forget that there are many really good information sites available on the web.       Thanks Aziz.

3) More questions here! (I included this last time too but it has been added to.)

4) Minimizing question.  We don't get many of these.

http://web2.0calc.com/questions/working-out-the-triangle-length-and-prism-length-of-a-equilateral-triangular-prism#rr1

* 5) Great Simultaneous equations - elimination method solution by Ninja

http://web2.0calc.com/questions/solve-2x-3y-7-x-y-3

* 6) A little Physics anyone?  Thanks Alan

http://web2.0calc.com/questions/physics_65

http://web2.0calc.com/questions/how-do-you-get-100-with-only-the-numbers-3-4-and-4

Using the Desmos calculator to graph inequalities.  (thanks Chris)

http://web2.0calc.com/questions/graph-the-inequality-2-y-2-2-y-4

8) Rosala's laugh.  Thanks Rosala

9) Good fluid solution question (thanks Chris and Alan)

http://web2.0calc.com/questions/how-much-pure-acid-should-be-mixed-with-3-gallons-of-40-acid-solution-in-order-to-get-a-90-acid-solution

10) I haven't had a chance to look at this yet but it might be interesting.

http://web2.0calc.com/questions/vedic-maths-worth-looking-at

11) This advanced maths has  been included before but Heureka has added to it. (Thanks Heureka)

♬                                        ♬ ♬ MELODY ♬ ♬                           ♫♪ You light up my life ♪ ♫

Aug 28, 2014
#99
+106943
0

Sunday 31/8/14

* 1) Proove that sqrt5 is irrational.

http://web2.0calc.com/questions/is-square-root-5-an-irrational-number

2 and 3) Physics - I do wish I understood more Physics.

http://web2.0calc.com/questions/i-need-to-understand-these-questions-in-details

4) How to find the last 2 digits.

http://web2.0calc.com/questions/find-the-last-two-digit-of-1122-1122

5) I always like these questions

http://web2.0calc.com/questions/town-a-and-town-b-are-780km-apart-a-car-travels-at-an-average-speed-of-68km-h-from-town-a-to-town-b-at-the-same-time-a-bus-travels-from-tow

♬                                        ♬ ♬ MELODY ♬ ♬                           ♫♪ You light up my life ♪ ♫

Aug 30, 2014
#100
+106943
0

Monday 1/9/14

1) This one looks interesting.

http://web2.0calc.com/questions/geometry_926

2) A log/exponential simplification.

http://web2.0calc.com/questions/1-2x-1-2-2xe-x-ln-3x-2-2

3) A little theory:   Fermat's last theorem.

http://web2.0calc.com/questions/fermat-s-last-theorem

4) How do you simplify a surd.  This is for our younger members.

5) Good little puzzle question

*6) Trigonometry - what could the answer be?

http://web2.0calc.com/questions/in-triangle-abc-if-ac-is-12-bc-is-11-and-angle-a-is-30-angle-c-could-be-what

*7) Find the height of the triangle - A good one for our rug rats.  (said with great affection)

http://web2.0calc.com/questions/a-triangle-has-an-area-of-72-square-inches-if-the-base-of-the-triangle-has-a-length-of-18-inches-what-is-the-height-of-the-triangle-use-t#rr2

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Aug 31, 2014
#101
+106943
0

Tues 2/9/14

*1) Finding the last 2 digits of a large power or a multiple.   Some very impressive number work here (Thanks Honga)

http://web2.0calc.com/questions/find-the-last-two-digit-of-1122-1122

2) Rotational Speed of a propeller

http://web2.0calc.com/questions/an-airplane-propeller-rotates-1000-times-per-min-find-the-number-of-degrees-that-a-point-on-the-edge-of-the-propeller-will-rotate-in-1-sec

*3) Probability, quadratics, ducks and geese.  It doesn't get any better than this! lol

http://web2.0calc.com/questions/probability-help-needed-thx

*4) Trig Proof - More  impressive solutions from Bertie and Heurka (Thanks guys)

http://web2.0calc.com/questions/geometry_926#r0

♬                                        ♬ ♬ MELODY ♬ ♬                           ♫♪ You light up my life ♪ ♫

Sep 1, 2014
#102
+106943
0

Wed 3/9/14

* 1) Fractions - Multiplying - Great explanation from Ninja.

2) I liked this one (Thanks Takahiro)

http://web2.0calc.com/questions/hi-im-18-and-i-was-wondering-what-is-2-plus-2

3) This early calculus one  made me think a little.   (I liked the web page Aziz sent me to too)

http://web2.0calc.com/questions/if-f-x-is-continuous-on-an-open-interval-it-is-di

4) Now we are a chemistry forum lol  (Thanks DavidQD)

http://web2.0calc.com/questions/chemistry-question-anyone-know-how-solve-it#r0

*5) Some algebra on a rectangle. (Thanks Aziz)

http://web2.0calc.com/questions/a-small-rectangular-park-is-being-desinged-the-perimeter-is-340-ft-total-the-width-is-100-ft-less-than-the-length-what-s-the-l-w

*6) I had some fun with this trigonometry question.

7) This one is causing some controversy. :)

http://web2.0calc.com/questions/if-pn-29cm-and-mn-13cm-then-pm

one-to-one and onto functions - a good little resource that Aziz found.

http://www.regentsprep.org/Regents/math/algtrig/ATP5/OntoFunctions.htm

♬                                        ♬ ♬ MELODY ♬ ♬                           ♫♪ You light up my life ♪ ♫

Sep 2, 2014
#103
+106943
0

Thurs 4/9/14

1) A bit of fun from Chris

*2) solving inequalities with absolute values.

*3) I did like this problem question.  Thanks Honga

http://web2.0calc.com/questions/how-do-i-solve-this_5

♬                                        ♬ ♬ MELODY ♬ ♬                           ♫♪ You light up my life ♪ ♫

Sep 3, 2014
#104
+106943
0

Fri 5/9/14

1) Rosala's laughs - thank Rosala

http://web2.0calc.com/questions/let-s-end-the-day-with-a-laugh_2

*2) Simple equation solving in great detail. lol

http://web2.0calc.com/questions/solve-3x-3-21

3) Here is an interesting 'chemistry' question (Thanks Alan)

*4) A great simultaneous equation answer from Ninja.

http://web2.0calc.com/questions/80-people-attended-a-baseball-game-everyone-there-was-a-fan-of-either-the-home-team-or-the-away-team-the-number-of-home-team-fans-was-68-l

*5) A look at limits.  Thanks Honga.

http://web2.0calc.com/questions/as-limits-approach-infinity

♬                                        ♬ ♬ MELODY ♬ ♬                           ♫♪ You light up my life ♪ ♫

Sep 4, 2014
#105
+106943
0

Sun 7/9/14

1) is it divisable by 3 - I handy trick to know (Thanks Alan)

http://web2.0calc.com/questions/is-1786-divisible-by-3

*2) Solving an equation using a graphing calculator.

http://web2.0calc.com/questions/6-sin-x-3-sin-2x-12-i-need-to-figure-out-the-value-of-x-but-i-don-t-know-how-to-use-graphing-calculator-i-want-to-know-how-to-use-it

*3) Here is a great combination question.  They are always contraversial  lol

♬                                        ♬ ♬ MELODY ♬ ♬                           ♫♪ You light up my life ♪ ♫

Sep 6, 2014
#106
+106943
0

Mon 8/9/14

1) This one provided some humour and it is very comforting for a queen to know that her kingdom is so fiercely defended.

2) I've only given this a short answer but some of our middle level people may like to take a look.

http://web2.0calc.com/questions/calculate-the-lateral-surface-area-in-m-2-of-a-pyramid-with-a-square-base-if-the-top-of-the-pyramid-reaches-42-m-into-the-air-and-the-base#r1

♬                                        ♬ ♬ MELODY ♬ ♬                           ♫♪ You light up my life ♪ ♫

Sep 7, 2014
#107
+106943
0

Tuesday 9-9-14

*1) Using the web 2 calc to find the equation of a quadratic through 3 given points. (Thanks Alan)

*2) Calculus - Chris has suggested a web site as a self teaching site.  This should be added to our resources.

*3) I have an unusual method for dealing with ANY rates question.

*4) These average speed questions always trick people.

http://web2.0calc.com/questions/a-car-travels-50kph-from-point-a-to-b-and-travels-40kph-back-what-is-the-average#rr2

5) We need to be very careful to answer the question that is put to us.  We often guess at its meaning but we must not add what is definitely not there.

http://web2.0calc.com/questions/f-x-x-x-8x-15

6) TheAnswerGuy has given us a web address where he makes "unicodeemicons"  I think some people would be interested in this.

7) Finding the lowest common multiple of a big number.  (Thanks Heureka)

http://web2.0calc.com/questions/find-the-lcm-of-32-84-180

*8) Catesian to polar co-ordinates (Thanks Alan and Heureka)

http://web2.0calc.com/questions/how-to-convert-polar-to-cartesian-and-vice-versa

*9) Co-odinate geometry.  Parallel line and restrictions on co-efficients.  (Thanks Heureka and Demogorgon)

♬                                        ♬ ♬ MELODY ♬ ♬                           ♫♪ You light up my life ♪ ♫

Sep 8, 2014
#108
+106943
0

Wed 10/9/14      ♬

*1) limits (Thanks Alan)

♫♪  ♪ ♫ ♫♪  ♪ ♫                                 ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫ ♫♪  ♪ ♫

Sep 9, 2014
#109
+106943
0

Thurs 11/9/14

1) Dragon's wrap and a lesson on time zones.

http://web2.0calc.com/questions/end-of-day-wrap

2) Findingthe area and the perimeter of a triangle given three coordinates (Thanks Chris and Heureka)

http://web2.0calc.com/questions/how-do-you-find-the-area-and-perimeter-of-a-figure-by-only-using-points#r2

3) An inequality reminder for our Rat Pack.

http://web2.0calc.com/questions/82-8-7x

4) A fantastic presentation from Ninja.  You just have to put this in your questions to learn form.  Please.

http://web2.0calc.com/questions/5-4-3k-12-3-2-2k-6-136

*5) A great standard deviation answer.    (Thanks Honga)

http://web2.0calc.com/questions/what-is-the-standard-deviation-of-1-25-1-1-5-1-25-1

*6) The easy solution is not always the only solution LOL  (Thanks Alan)

*7) I never fail to be surprised at what the Web2 calculator can do.  (Thanks Alan)

http://web2.0calc.com/questions/can-you-do-factors-on-this

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Sep 10, 2014
#110
+106943
0

Fri 12/9/14

1) Reinout-g's lunchbox unwraps have returned.  Good, I like this one

http://web2.0calc.com/questions/begin-of-lunch-box-unwrap_8

2) 3 dimensional co-ordinate geometry.  This one looks interesting.

3)Laught's from Rosala and FreemanRufus

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Sep 11, 2014
#111
+106943
0

Sunday 13/9/14

1) Break even point  (Thanks Chris)

http://web2.0calc.com/questions/company-wants-to-introduce-a-new-product-the-company-estimates-the-variablecosts-would-be-8-and-the-fixed-costs-would-be-70-000

2) Using calculator to find remainders (Thanks Alan)

http://web2.0calc.com/questions/how-to-find-remainders-in-web-calc

4 and 5) Good stuff to remember with trigonometry.   (Thanks Chris)

http://web2.0calc.com/questions/cos12-sin78

http://web2.0calc.com/questions/write-the-equation-of-a-sine-function-that-has-the-following-characteristics-amplitude-9-period-6pi-and-phase-shift-1-4

6) Look at this wonderful plot that you can get from three dimensional graphing (Thanks Chris)

7) Differentiating inverse trig

http://web2.0calc.com/questions/derivative-of-arctan-x-2

8) the effect of compounding never fails to amaze!

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Sep 13, 2014
#112
+106943
0

Monday 15/9/14

1,2) Equations with absolute values  (Thanks Chris)

3)A derivative exercise  (Melody)

http://web2.0calc.com/questions/what-is-the-derivative-of-f-x-f-x-sqrt-x-5

4)Water currents and direction of swim.  I like these questions, they always make me think.  (Thanks Chris)4

http://web2.0calc.com/questions/you-are-a-member-of-a-production-crew-filming-a-nature-explorer-in-the-rocky-mountains-the-explorer-needs-to-swim-across-a-river-to-his-cam

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Sep 14, 2014
#113
+106943
0

Tues  16/9/14

1) Rosala's Laughs.    (Thanks Rosala)

http://web2.0calc.com/questions/let-s-end-the-day-with-a-rare-and-a-special-laugh_1

2) Look you have just got to be impressed (or at least amused)!  (Melody and Chris)

http://web2.0calc.com/questions/all-x-s-that-count-for-5-x-2-3-x-4

3) $$f \circ g$$   this was a very poorly presented question but a good one to answer (Melody)

http://web2.0calc.com/questions/let-displaystyle-f-x-frac-1-x-3-and-displaystyle-g-x-frac-1-x-7-then-the-domain-of-f-circ-g-is-equal-to-all-reals-except-for

4) Fractions and factorising with algebra - Some of the older rat pack might like to try this one. (Melody)

http://web2.0calc.com/questions/simplify-5x-1-x-2-x-2-3-x-2

5,6)  Some good physics and calculus  (Thanks to Melody Alan and Reinout-g)

http://web2.0calc.com/questions/a-ball-is-thrown-upward-what-is-the-intial-vertical-speed-the-accleration-of-gravity-is-9-8m-s-2-and-max-height-is-6-5m-neglect-air-resis

http://web2.0calc.com/questions/two-students-on-a-balcony-18-8m-above-the-street-one-student-throws-a-ball-vertically-downward-13-1-m-s-at-the-same-instant-the-onther-st_1

7) Annuities and Finance  (Melody)

http://web2.0calc.com/questions/you-deposit-100-at-the-end-of-each-quarter-in-a-sinking-fund-earning-4-compounded-quarterly-how-many-quarterly-deposits-must-you-make-in

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Sep 15, 2014
#114
+106943
0

Wed 17/9/14

1) Reinout's Lunchbox unwrap.  Thank you

http://web2.0calc.com/questions/begin-of-lunch-box-unwrap_9

2) We are gettin a collection of birthdays here!

http://web2.0calc.com/questions/let-s-end-the-day-with-a-rare-and-a-special-laugh_1#r7

2) A touch of prabability.   Thanks to Alan and Melody

http://web2.0calc.com/questions/i-have-5-tickets-for-a-lottery-that-contains-a-total-of-100-000-tickets-100-tickets-are-drawn-what-are-the-chances-of-me-winning

3) Plenty of enthusiam here.  LOL

4) A couple of fun answers (Thanks Anonymous and CPhill)

http://web2.0calc.com/questions/if-bob-has-3-blue-shirts-and-rob-has-4-how-many-do-they-have-in-all#r2

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Sep 16, 2014
#115
+106943
0

Fri 19/9/14

1) A problem with the site calc (Heureka and Melody)

2,3,4) Calculus      Thanks to Alan ans Melody.

http://web2.0calc.com/questions/how-to-do-it#rr1

http://web2.0calc.com/questions/need-help-with-calculus-problems

http://web2.0calc.com/questions/find-the-max-and-min-of-f-x-x-2e-x-2-1-8#rr1

5) Scientific notation multiplication, a thorough explanation.  Thanks Alan

6) Probability -  Birthday Paradox  (Melody)

7) Interesting graph.  (Melody)

http://web2.0calc.com/questions/someone-help-me-sketch-a-graph-for-these-limits

8) Function Notation  (Thanks Alan)

9) Trig identity  (Thanks Heureka)

10) What is Trigonometry?  (Thanks Chloe)

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Sep 18, 2014
#116
+106943
0

Sat 20/9/14

1) limits - Differentiation from first principals - Sort of.

http://web2.0calc.com/questions/determining-a-limit

2) I don't understand this question.  Thanks for your interpretation Alan.

http://web2.0calc.com/questions/two-multiple-choice-questions

3) Here is a colourful one by NinjaDevo

http://web2.0calc.com/questions/slove-by-subtitution-2x-3y-0-x-2y-1

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Sep 19, 2014
#117
+106943
0

Sun 21/9/14

Some new ideas on continuous functions and floor notation.  (Thanks Alan, Chilledznon and Melody)

http://web2.0calc.com/questions/two-multiple-choice-questions

Gravitational Force.

http://web2.0calc.com/questions/how-can-i-compute-gravitational-force-for-astronomy

How to divide by a fraction.

http://web2.0calc.com/questions/2-3-6-7

This compound interest one was different from usual.   (Melody)

http://web2.0calc.com/questions/travis-has-a-savings-account-that-his-parents-opened-for-him-it-pays-6-annual-interest-his-uncle-also-opened-an-account-for-him-but-it-p

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Sep 20, 2014
#118
+106943
0

Mon 22/9/14

1) Turning words into equations can be a difficult concept to learn.  (Thanks Ninja)

http://web2.0calc.com/questions/which-of-the-following-mathematical-expressions-is-equivalent-to-the-verbal-expression-a-number-x-squared-is-39-more-than-the-product-of

2) A look at limits

http://web2.0calc.com/questions/help-with-calculus-question

http://web2.0calc.com/questions/limit-as-x-approaches-1-ln-x-1

3) Another top quality answer from Ninja

http://web2.0calc.com/questions/find-the-coordinates-of-the-midpoint-of-segment-hx-h-5-1-2-4-1-4-x-3-3-4-1-1-4

4) Sector of a circle (Thanks Chris)

http://web2.0calc.com/questions/a-sprinkler-system-on-a-farm-is-set-to-spray-water-over-a-distance-of-35-meters-and-to-rotate-through-an-angle-of-140degrees-find-the-area

5) This is an old Puzzle but a really good one.  I hid CPhill's answer so that you can work it out for yourselves.

The \$30 hotel puzzle.    (Thanks Landry)

This one has been around for ever - that is because it is so good!

I have hidden CPhill's answer so if you want the answer from a moderator you might have to beg.   LOL

http://web2.0calc.com/questions/just-a-little-riddle#rr1

6) Another special edition by Heureka (Thanks Heureka   )

http://web2.0calc.com/questions/solve-3x-3-21x-2-50x-220-0

7) More with imaginary numbers (Thanks Alan and Anon)

8) Here is something people might like to play with.

http://web2.0calc.com/questions/how-can-i-get-6-only-using-4-4-times

9) New Notation - I am not sure if it has been included before.

http://web2.0calc.com/questions/two-multiple-choice-questions

10) This Divisor Table is quite interesting I think (Thanks Heureka)

http://web2.0calc.com/questions/what-is-1190-divisible-by

11) This looks pretty impressive by anonymous

http://web2.0calc.com/questions/find-the-inverse-3x-4-8-5-10-9-f-x#r0

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Sep 21, 2014
#119
+106943
0

Thurs 25/9/14

1) Motion diagrams - These always make people think.  (thanks Chris and Alan)

http://web2.0calc.com/questions/motion-diagram

2) Hint for finding quadratic factors.  Melody

http://web2.0calc.com/questions/product-of-48-sum-of-14

3) I liked this one!   Thanks to Chris and Melody.   Thank you also to our new member Quinn for supplying the question.

http://web2.0calc.com/questions/if-x-2-2011x-1-0-is-true-then-waht-is-the-value-of-x-2010x-2011-x-2-1

4) This is an good one for people who want to practice a bit of trig.  Thanks Chris.

http://web2.0calc.com/questions/a-car-is-driven-165-km-west-and-then-95-km-southwest-what-is-the-displacement-of-the-car-from-the-point-of-origin-magnitude-and-direction

5) Divide by zero - Not a good idea!

http://web2.0calc.com/questions/how-do-i-divide-by-zero

6) This puzzle is so cool!  I'm putting it in the Puzzles Sticky note!   (Thanks Alan and Stu)

http://web2.0calc.com/questions/problem-solve-this-given-to-primary-school-children-in-china#r12

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Sep 24, 2014
#120
+106943
0

Fri 26/9/14

1) What does this question mean?  (thanks Quinn - is Quinn correct?)

2) A guess job from melody, Chris has added to it since (thanks Chris).   Function notation.

3)Difficult volume question. (Thanks Chris)

http://web2.0calc.com/questions/when-0-5-cm-was-planed-off-each-of-the-six-faces-of-a-wooden-cube-its-volume-decreased-by-169cm-3-find-its-new-volume

4) A taste of factoring with complex (imaginary) numbers.  (thanks Geno3141)

http://web2.0calc.com/questions/factor-x-2-6

5) Would anyone like to respond to this one?

http://web2.0calc.com/questions/11-101-10001-100000001-10000000000000001-100000000000000000000000000000001

6) Simultaneous log equations.  (Thanks Heureka)

http://web2.0calc.com/questions/logy-x-3-logy-4x-5

7) Handling horrible algbraic fractions.    (Melody)

8) Rationalising the denominator, a little different from ususal  (Thanks Melody and Geno3141)

http://web2.0calc.com/questions/rationalize-the-denominator-1-cube-root-a

9) Introducing Kelvin temporature scale.

http://web2.0calc.com/questions/k-c-273-15

10) This is an example of where the wording must be thought about very carefully.  (Thanks Coolkille98)

11) This might be a good one for some younger students to think about.  (Thanks to Melody and Quinn)

http://web2.0calc.com/questions/if-nbsp-nbsp-nbsp-7x-3-5x-ndash-7-evaluate-nbsp-nbsp-4-2x-ndash-2

12) This one has got me stumped.   (Quinn is going to provide our 'good' ones - I like a challenge, thanks Quinn)

http://web2.0calc.com/questions/in-the-triangle-abc-a-b-c-are-the-3-sides-of-the-triangle-if-a-1-x-2-2bx-c-1-x-2-2-is-a-qudratic-equation-the-equation-have-two-same-sol

13)  This interest rate one looks like it might have been fun. (Thanks Geno3141)

http://web2.0calc.com/questions/find-the-interest-rate

14) I thought I would add this one because Chris says i got it wrong.

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Sep 25, 2014
#121
+106943
0

Sat 27/9/14

1) Rosala's funnies   (Thanks Rosala)

http://web2.0calc.com/questions/fun-is-back-in-the-city-of-camelot

2) Some of our clever, younger ones may find this question interesting.  I am thinking of mainly of Ninja. (Melody)

http://web2.0calc.com/questions/total-distance

3) A good one for high school physics students. (Melody)

http://web2.0calc.com/questions/formula-of-question

4) This one was included yesterday as well but the question turned out to be incorrect.

There is a proper question with a proper answer now.

Although I think heareka answered the harder original question.

http://web2.0calc.com/questions/in-the-triangle-abc-a-b-c-are-the-3-sides-of-the-triangle-if-a-1-x-2-2bx-c-1-x-2-2-is-a-qudratic-equation-the-equation-have-two-same-sol

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Sep 26, 2014
#122
+106943
0

Sun 28/9/14

1) A place called Useless Loop LOL

http://web2.0calc.com/questions/don-t-these-questions-ever-stop-nbsp-nbsp-nbsp

2) Happy daughter's day (Thanks Rosala)

http://web2.0calc.com/questions/happy-daughter-s-day-to-everyone

3) Factoring. Another great question from Quinn.

4) This one makes my brain hurt    (Thanks Gino3141)

http://web2.0calc.com/questions/11-101-10001-100000001-10000000000000001-100000000000000000000000000000001_1

5,6) A little maths in Chemistry.  (Thanks Alan and anon)

http://web2.0calc.com/questions/use-a-calculator-to-find-an-exponential-curve-f-x-b-a-x-that-models-the-amount-of-iodine-131-remaining-after-x-hours

http://web2.0calc.com/questions/need-help_24#r1

7) A good little log question  (thanks Anon, Melody and Alan)

http://web2.0calc.com/questions/logarithm_4

8) Another Physics graphs interpretation.  (We need Alan's input here)

http://web2.0calc.com/questions/motion-diagram_1

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Sep 27, 2014
#123
+106943
0

Mon 29/9/14

1) do donkeys fly?  What a silly question.

http://web2.0calc.com/questions/do-donkeys-fly

2) size of a tile - I really liked this question.

3) Proof by contradiction. (Thanks Geno3141, anon and Melody)

http://web2.0calc.com/questions/prove-that-x-15-x-5-2-0-do-not-have-positive-roots

4) This factorising question was included yesterday but Quinn has added to it and I really liked this new post.

http://web2.0calc.com/questions/factoring_14

5,6) Motion diagrams - These always make me think really hard.

Alan, I have added a further query on these I think.

http://web2.0calc.com/questions/motion-diagrams

http://web2.0calc.com/questions/motion-diagram_1

7) More Physics - Thanks Chris

http://web2.0calc.com/questions/a-ball-is-thrown-horizontally-from-the-top-of-a-building-25-3-m-high-the-ball-strikes-the-ground-at-a-point-32-9-m-from-the-base-of-the-bui

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Sep 28, 2014
#124
+106943
0

Tues 29/9/14

1) Finding last digit

2) What graphing calculators do we use?

3) Even and odd functons  (Thanks Geno)

http://web2.0calc.com/questions/f-x-3x-7-even-odd-or-neither-determine-algebraically

4) Vectors  (Thanks Chris)

http://web2.0calc.com/questions/determine-the-resultant-velocity-of-75-m-sec-25-degrees-east-of-north-and-100-m-sec-25-degrees-east-of-south

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Sep 29, 2014
#125
+106943
0

1/10/14

1) MacLaurin Series Expansion  (Thanks Alan)

2) Simplifying negative and fractional indices.  (Thanks Alan)

3) A nice proof by Alan.  Thank you

http://web2.0calc.com/questions/if-a-b-care-the-3-sides-of-the-triangle-abc-and-nbsp-a-2-b-2-c-2-ab-bc-ac-what-is-the-shape-of-the-triangle

4) Speed with a good dose of humour - Thanks Chris.

5) The title says it all - Thanks Chris.

http://web2.0calc.com/questions/why-is-a-number-to-the-power-of-0-always-1

6) Solving a trig equation - Thanks geno3141

http://web2.0calc.com/questions/solve-5sin-2-3cosx-4-domain-0-2pi

7) What is a dependent variable?  - Thanks geno3141

http://web2.0calc.com/questions/what-is-a-dependent-variable

8) Derivation of a calculus formula.   Thanks geno and Chris.

http://web2.0calc.com/questions/how-do-you-derive-the-power-rule-that-is-used-in-calculus-for-differentiation

9) I just found this post concerningWeb2 calclets.  I do not understand what they are for, can anyone explain them?

http://web2.0calc.com/questions/soo-errrm-calculet#r3

10) I only just did this one, I think it is alright. - Volume of revolution.

http://web2.0calc.com/questions/what-is-the-volume-of-rotation

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Sep 30, 2014
#126
+106943
0

Thurs 2/10/14

1) Dragons 'opinion' of us all.   (Thanks Dragon)

http://web2.0calc.com/questions/dragonslayer554-s-oppinion-3-the-oppinion-s-came-back

2) This appealed to me.  (Thanks Dragon)

http://web2.0calc.com/questions/do-dogs-grow-on-trees

3) I liked this one.  It made me and Alan think.   Thermal expansion.

4) Something for the youngsters. Gino has given a great answer here.  Perhaps one of the youngsters can set up the equation that he has described.  OR maybe you can show us another example of your own.

http://web2.0calc.com/questions/describe-two-real-word-situations-that-can-be-represented-by-the-same-two-step-equation

5) Recursive Formula - This wording was unfamiliar to me - Thanks Gino.

http://web2.0calc.com/questions/how-to-write-a-recursive-formula

6) I always like these speed, distance time questions.  Thanks Chris.

http://web2.0calc.com/questions/the-race

7) A touch of physics - Forces (Thanks Alan)

http://web2.0calc.com/questions/a-1-85kg-block-is-held-in-equilibrium-on-an-incline-of-angle-67-7-by-a-horizontal-force-f-applied-in-the-horizontal-direction-if-the

8) We don't just learn maths here!   (Thanks Dragon, CPhill and Kitty<3)

http://web2.0calc.com/questions/kitty-3-and-cphill-wait

http://web2.0calc.com/questions/which-poem-is-the-best

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Oct 1, 2014
#127
+106943
0

### Do not give personal information to anyone on the forum.

Do not give your full name

Do not give your phone number.

Do not give your personal email.

### Always be conscious that who people say they are may NOT be anything like who they really are!

Oct 2, 2014
#128
+106943
0

Fri 3/10/14

1) The Ghost of Web2.0 calc has graced us with a visit, laying a lay of lavish wonderment at the feet of our dear Princess Kitty.

http://web2.0calc.com/questions/kitty-3-and-cphill-wait

2) Playing with the imaginary number i

http://web2.0calc.com/questions/what-does-i-equals-to

3)Trailing zeros in factorials.  I like these.  Thanks Gino and Chris.

http://web2.0calc.com/questions/number-2014-how-many-0-s-it-got-in-the-row-at-the-end-of-that-number

4) Graphing Trig  (Gino and Melody)

6) More Physics from Alan, I really must find the time to learn from you Alan.   Thank you.

http://web2.0calc.com/questions/jake-drags-a-sled-of-a-mass-of-25kg-across-the-snow-the-sled-is-attached-to-a-rope-that-he-pulls-wut-a-force-of-50n-at-an-angle-of-32degree

7) Something interesting for the children.

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Oct 3, 2014
#129
+106943
0

Sat 4/10/14

1) BREAKING NEWS - THE TOWN CRIER IS ANNOUNCING A VERY IMPORTANT MESSAGE.

http://web2.0calc.com/questions/hear-ye-hear-ye

1) Thanks Rosala, your laughs are always great.

http://web2.0calc.com/questions/let-s-end-the-day-with-a-laugh_3

2) I like these.  Thanks for the answer CPhill.

http://web2.0calc.com/questions/how-do-i-make-100-using-four-4s

3) Graphing tangent function.  Thanks to Chris and Melody.

http://web2.0calc.com/questions/which-graph-best-represents-tan-x-2-y-pictures-included

4) What happens if a number is raised to the power of 0?  Thanks for promoting the discussion Rosala.

http://web2.0calc.com/questions/how-do-you-plug-in-10-to-the-0-power-on-a-calculator

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Oct 3, 2014
#131
+106943
0

Tues 6/10/14

Considerations when integrating (Thanks Alan)

http://web2.0calc.com/questions/what-is-the-third-integral-of-arcsin-tan-lnx-x-4-x

1) It is really important to read worded questions carefully and interprete them correctly. (Thanks Chris)

2) What is a rational number?  -  Thanks Gino3141

3) This trig one is just a bit different - Thanks Radio and Chris

http://web2.0calc.com/questions/math-question-with-pic

4) Finding remainders using calculators.  Modular arithmetic (Thanks Chris and Melody)

5) Divisability of numbers  Thanks Chris.

6) Playing with trig - Thanks Gino, CPhill, Melody and Alan.

7) I love Chris's humour - and he is so quick off the mark.

http://web2.0calc.com/questions/remove-anonymous-posting

8) Tricky limits question - Great explanation from Alan.

http://web2.0calc.com/questions/limits-involving-infinity

9) I found this one interesting.  Thanks Alan

http://web2.0calc.com/questions/what-is-the-volume-of-rotation-no2

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Oct 6, 2014
#132
+106943
0

Tues 7/10/14

1) Sum of rates questions can be really tricky.  (Thanks CPhill)

http://web2.0calc.com/questions/lee-can-frame-a-cabin-in-4-days-less-than-ron-when-they-work-together-they-will-do-the-job-in-4-days-how-long-would-each-of-them-take-to#rr2

2) Making mathematical sense of words.  Thanks Chris

http://web2.0calc.com/questions/bobette-is-an-excellent-athlete-in-school-she-competed-in-lacrosse-soccer-softball-and-tennis-she-won-6-more-awards-in-lacrosse-than-in

3) Differentiating Trig - always fun :)

http://web2.0calc.com/questions/what-is-derivative-of-secx-2

4) Binomials, factorial and gamma functions - Thanks Geno and Alan and Quinn for providing question :)

http://web2.0calc.com/questions/in-a-trail-supposea-lawyer-wants-2-men-and-5-womento-make-up-a-special-panel-so-the-formlar-is-ncr-n-r-n-r-right-so-5c2-5-2-5-2

6) I think the children will like this one - Thanks CPhill, DragonSlayer554 and anon.

http://web2.0calc.com/questions/how-many-licks-does-it-take-to-get-to-the-center-of-a-totsiepop

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Oct 7, 2014
#133
+106943
0

9/10/14

1) Chris's Puzzle of the day  -  Thanks Chris

http://web2.0calc.com/questions/cphill-s-puzzle-for-the-day

2) What is the number Phi   -   Thanks Geno and Chris

http://web2.0calc.com/questions/what-is-the-number-phi

3) This trigonometry (tides) one took some thought, Chris also gave an approximate answer that was more easily found  -  CPhill and Melody

http://web2.0calc.com/questions/the-captain-of-a-shipping-vessel-must-consider-the-tides-when-entering-a-seaport-high-tide-is-at-5am-at-10-6-meters-and-low-tide-is-at-11am#r1

4) Finding the vertex from a quadratic equations. this is a realyy good one for people to understand.  Thanks Chris.

http://web2.0calc.com/questions/what-is-the-vertex-of-x-2-8x-5

5) A simple question that our budding mathematicians should understand :)  Thanks Chris

http://web2.0calc.com/questions/intermediate-value#r2

6) There is always more to learn.  Thanks Rosala for biginning this thread and thanks to the anon who draw our attention back to it.

7) This Physics one looks interesting but I haven't had time to really think about it yet.    Thanks Alan

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Oct 9, 2014
#134
+106943
0

Sun  12/10/14

1) Let's learn a little about Delhi.  Thank you Rosala.

http://web2.0calc.com/questions/hey-let-s-end-the-day-today-by-getting-to-know-something-informative

2) There is always room for some maths humour.  Thanks Chris.

http://web2.0calc.com/questions/what-is-9-10

3) Reducing by a percentage. Great question for the younger members.   Thanks Chris.

http://web2.0calc.com/questions/in-a-sale-normal-prices-are-reduced-by-12

4) This volume question was a little different - Another good one for young and old alike - Thanks Geno3141

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Oct 11, 2014
#135
+106943
0

Mon 13/10/14

1) Light fun with numbers.

2) Why is 3.6 divided by 0.09 = 40?   (Thanks Gino and Melody)

3) I did find this one amusing.

4) Why does a negative times a negative = a positive     Thanks Melody and Chris.

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Oct 12, 2014
#136
+106943
0

Tues 13/10/14

1) Algebra concepts   Thanks Geno, Chris and Melody.

http://web2.0calc.com/questions/how-do-i-solve-for-x-in-this-xy-5-x-7-i-cant-figure-it-out-and-i-really-need-help#rr7

2) Two Physics questions - Maybe Alan can help out.

http://web2.0calc.com/questions/motion-in-2-dimension

http://web2.0calc.com/questions/how-do-you-find-the-friction-between-2-objects-given-that-the-acceleration-of-the-objext-is-8-75m-s-7newtons-and-o-8kg-the-first-object-wi

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Oct 13, 2014
#137
+106943
0

Wed 14/10/14

1) a bit of light fun.

http://web2.0calc.com/questions/if-joe-has-ten-snicker-bars-and-eats-8-what-does-he-have

2) Interesting simultaneous equations   Thanks Geno.

http://web2.0calc.com/questions/the-product-of-two-numbers-is-six-times-their-sum-the-sum-of-their-squares-is-325-what-are-the-two-numbers#r2

3) Chris puts his forensic skills to work yet again.  :)

http://web2.0calc.com/questions/how-to-find-total-no-of-possibilities-of-pin-through-victorials#r2

4) Trig identities are fun   Thanks to Melody and Chris.

5) Vectors    Thanks Alan

6) Takahiro invites you to find the fallacy.

http://web2.0calc.com/questions/what-is-2-2_28

7) Interesting velocity question.     (Thanks Melody and Chris)

8) miles per hour to radians per second   Thanks Chris

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Oct 14, 2014
#138
+106943
0

Thursday  15/10/14

2) Integration by parts   Thanks Gino

http://web2.0calc.com/questions/what-is-the-antiderivitive-of-xsin-7x

3)  Terminology. New word anyone      Thanks Chris and Geno.

http://web2.0calc.com/questions/in-scientific-notation-what-is-the-decimal-before-the-10-to-the-something-power-called

http://web2.0calc.com/questions/an-n-1-2n-3-find-the-n-in-this-que#r0

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Oct 15, 2014
#139
+106943
0

Fri 16/10/14

1) Demo of the distributive law.       Thanks  Alan and Melody

http://web2.0calc.com/questions/i-don-t-get-distributive-property

2) Revolting trig equation         Thanks Alan and Heureka

http://web2.0calc.com/questions/1298cosx-2770sinx-325-8

3) Integer sequence   (not in OEIS either)     Thanks Heureka.

4) There is always room for a puzzle

(It is nice to see that LancelotLink can be funny without the use of itching powder)

http://web2.0calc.com/questions/how-do-you-find-local-gravitational-potential#r0

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Oct 16, 2014
#140
+106943
0

Sat 18/10/14

1) A lovely visit from NinjaDevo and GoldenLeaf.

http://web2.0calc.com/questions/happy-friday

2) Isn't it great when all our experts agree! Thanks CPhill, Alan and Heureka.

3) Ratios in 3 dimensionsl figures   Thanks Melody and Heureka.

4) It is good to get some an integral   Thanks Chris

http://web2.0calc.com/questions/calculus-what-is-this-integral

5) Rotation about the origin.  Thanks CPhill and Geno.

6) Finding all rational roots of a polynomial.      Thanks Chris and Alan.

http://web2.0calc.com/questions/help-with-rational-root-thm

7) Finding the square root without a calculator.  Thanks Chris and Geno and anon.

http://web2.0calc.com/questions/is-it-possible-to-find-the-square-root-of-an-number-without-a-calculator

8) Math or maths?  That is the question.

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Oct 17, 2014
#141
+106943
0

Sun 19/10/14

1) Integration by parts - It was fun :)

http://web2.0calc.com/questions/integrate-the-inverse-sine-of-x---by-parts

2) Working with ratios    Thanks Gino, Chris and Melody

http://web2.0calc.com/questions/in-a-school-1620-pupils-the-ratio-of-boys-to-girls-is-4-5-what-is-the-nunber-of-girls-in-the-school

3) What do it mean if you divide by a fraction

4) Limits - This one took some effort

http://web2.0calc.com/questions/hope-i-can-do-this

5) Complex numbers and trig    Thanks Alan

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Oct 18, 2014
#142
+106943
0

Mon 20/10/14

1) These inequalities look interesting.    Thanks Chris and Alan.

2) Determine equation of parabola in vertex form.    Melody

http://web2.0calc.com/questions/water-is-spraying-from-a-nozzle-in-a-fountain-forming-a-parabolic-path-as-it-travels-through-the-air-the-nozzle-is-10-cm-above-the-surface

3) These physics ones look interesting. Thanks sevenUP and Alan

http://web2.0calc.com/questions/physics-questions

4) This is an old limits one but it has been added too.

http://web2.0calc.com/questions/hope-i-can-do-this

5) A good volume one for the younger set.  Thanks Chris

http://web2.0calc.com/questions/a-cube-of-metal-side-is-7cm-melted-down-and-recast-in-a-cylindrical-mould-with-a-diameter-of-3cm-how-long-is-the-cylinder-of-metal

6) Comparing large numbers   Thanks CPhill and Geno3141

http://web2.0calc.com/questions/is-8-x-10-67-greater-than-10-70#r0

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Oct 19, 2014
#143
+106943
0

Tues 21-10-14

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Oct 20, 2014
#144
+106943
0

Wed 22/10/14

1) This Physics one looks interesting.  Thanks Alan

http://web2.0calc.com/questions/an-extreme-skier-starting-from-rest-coasts-down-a-mountain-that-makes-an-angle-of-30-9-with-the-horizontal-the-coefficient-of-kinetic-f

2) This calculus one is of personal interest to me.    Thanks Alan

http://web2.0calc.com/questions/how-do-you-find-a-total-mass-using-spherical-shells-for-example-the-total-mass-of-a-spherical-galaxy-with-a-mass-density-at-a-distance-s

3) Limits.    Great little demo from Chris.  Thanks to Gino too.

http://web2.0calc.com/questions/limits-question

4) This one has value  :)

5) I was about to white this one out before I saw all the respones.  Then I decided to display it instead. :)

6) Probability notation  Thanks Geno3141

7) Bririshrain thought some people could make use of these printable times table charts.

8) A play with factorials

http://web2.0calc.com/questions/what-is-1000-999

9) More calculus for Alan.   He has been offered some primate help though.    LOL

http://web2.0calc.com/questions/considering-a-spherical-galaxy-with-a-volumetric-mass-density-s-from-the-center-of-the-galaxy-given-by-p-s-c-1-s-3#r2

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Oct 21, 2014
#145
+106943
0

Thurs 23/10/14

1) Rosala is back in Camelot  Yeah!

http://web2.0calc.com/questions/hello-people-im-back#r0

2) Solving trig equation, graphically and algebraically.    Thanks Chris and Melody

http://web2.0calc.com/questions/trig-questions_1#r2

3) The web2 calc never fails to surprise.   Thanks Heureka.

http://web2.0calc.com/questions/what-is-5-m-squared-converted-to-cm-squared#r5

4,5,6) This is a couple of good one for the middle school students among you.  Thanks Geno

http://web2.0calc.com/questions/how-long-does-it-take-for-a-nerve-impulse-to-travel-from-the-spinal-cord-to-the-big-toe-assuming-the-distance-traveled-is-one-meter-and-the

http://web2.0calc.com/questions/help-how-can-i-graph-y-2x-2-using-the-xy-chart-method-you-must-show-your-xy-chart-with-3-ordered-pairs-you-find

7) Here's one I want to look at (haven't got to it yet) - Thanks Gino and Alan.

http://web2.0calc.com/questions/given-the-value-of-the-integral

8) Maths in chemistry  Thanks Alan

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Oct 22, 2014
#146
+106943
0

Fri 24/10/14

1) This simultaneous equations question was different - I liked it

http://web2.0calc.com/questions/a-2-ab-15-2b-2-20-2ab-what-could-a-b-be-worth-1-35-2-25-3-25-4-5

2) I always like these.  Thanks Gino

http://web2.0calc.com/questions/what-is-the-last-digit-of-3-45000

3) This one does look interesting.  Thanks CPhill

4) Here is a tough factorization.

http://web2.0calc.com/questions/factorization

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Oct 24, 2014
#147
+106943
0

Sat 25/10/14

1) Calculus - rates - I like these but I got really frustrated because there are only 100cm in a metre.  Doh!

Thanks Chimp Ayumu, LancelotLink, Chris and Alan (and even I eventually got it right)

http://web2.0calc.com/questions/water-is-leaking-out-of-an-inverted-conical-tank-at-a-rate-of-11-000-cm3-min-at-the-same-time-that-water-is-being-pumped-into-the-tank-at-a

2) Limits  thanks to Alan, Gino and Melody.

3) A spot of physics anyone?   Thanks Alan and Gino

http://web2.0calc.com/questions/physics-velocity#r2

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                           ♫♪  ♪ ♫

Oct 24, 2014
#148
+106943
0

Sun 26/10/14

1) Vectors.   Thanks Alan

http://web2.0calc.com/questions/204-202-200-6-4-2-203-201-199-5-3-1

3) Proof with complex numbers    Thanks Alan, Gino and Melody.

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                              ♫♪  ♪ ♫

Oct 25, 2014
#149
+106943
0

Mon 27/10/14

1) This one looks really interesting.  Thanks Chris and anonymous.

2) This is another that I need to look at properly.       Thanks Alan and CPhill

http://web2.0calc.com/questions/carl-has-a-rectangle-whose-side-lengths-are-positive-integers-this-rectangle-has-the-property-that-when-he-increases-the-width-by-1-unit-an

3) This looks interesting.  Thanks Chris

http://web2.0calc.com/questions/for-what-values-of-nbsp-nbsp-is

4,5) This is hilarious.  Thanks LancelotLink

http://web2.0calc.com/questions/how-do-you-find

6) This was different - how do you cut a cirlce in half without going through the middle  Thanks CPhill and Gino

http://web2.0calc.com/questions/cut-a-circle-in-half-not-through-middle

7) Chris tells me to include this under "things that confuse Chris".  It is really not that bad.

http://web2.0calc.com/questions/parabola-parametric-equation

8) This is a great middle high school revision question.  Thanks Gino

http://web2.0calc.com/questions/anyone

9) I always like these.  This one doesn't look to hard but I could be wrong.   Thanks Chris

http://web2.0calc.com/questions/15-laborers-dig-40-acres-for-40-days-how-much-days-wants-20-laborers-for-60-acres

10) This one looked good. Parabolic dish    Thanks Chris and Geno.

http://web2.0calc.com/questions/satellite-dish-antennas-have-the-shape-of-a-parabola-consider-a-satellite-dish-that-is-80-cm-across-its-cross-sectional-shape-can-be-descr

11) Chris's calculus is very impressive.

12) Interesting info from CPhill.

http://web2.0calc.com/questions/if-maths-is-based-on-set-rules-and-logic-how-can-there-be-an-imaginary-number

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                              ♫♪  ♪ ♫

Oct 26, 2014
#150
+106943
0

Tues 28/10/14

http://web2.0calc.com/questions/use-the-newton-s-method-to-approximate-the-solution-of-the-equation-1-x-tan-x-0-starting-at-x_-0-0-5

2) This looks interesting and not too hard.  Thanks CPhill

http://web2.0calc.com/questions/a-car-drives-12-m-s-s-for-5-0-s-then-18-m-s-n-for-9-0-s-and-finally-15-m-s-s-for-11-s-calculate-the-distance-and-displacement-of-th

3) Another interesting one.  Thanks Gino

4) An interesting limit analysis from Alan.

5) a little history lesson - Thanks Geno

6) Calculus used with population growth. Alan and  CPhill have not reached an agreement yet.  :))

http://web2.0calc.com/questions/the-population-of-the-human-race-in-2000-was-6100-million-with-an-annual-growth-rate-of-1-4-the-population-in-millions-as-a-function-of

7) I have to include some physics      Thanks Alan.

http://web2.0calc.com/questions/a-long-spring-is-hung-vertically-with-a-weight-attached-to-the-bottom-once-the-spring-has-stopped-moving-the-weight-is-pulled-down-exactly

8) Calculus in a commercial setting.   Thanks Alan

9) This is one that middle high school students could attempt.   Thanks Chris

http://web2.0calc.com/questions/volume-of-frustum-with-diameters-of-30cm-and-15cm-and-a-height-of-25cm

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                              ♫♪  ♪ ♫

Oct 27, 2014
#151
+106943
0

Wed 29/10/14

1)  A bit of 'imaginary' information :)

http://web2.0calc.com/questions/relation-between-pi-and-e

2) I liked this trig one.  Thanks Gino and Chris

3) I like these ones too.  function of a function.  Thanks Chris and Geno

4) How DID archimedes find pi (This is a great question)  ?  Thanks Alan and CPhill.

5) Surface area of a cone    Thanks Chris and Geno

6) CPhill and I like the way anonymous attacked this question.  Thanks anon.

http://web2.0calc.com/questions/how-can-i-make-a-total-of-37-using-only-10-numbers-from-8-1-s-9-3-s-8-5-s-and-8-7-s#r2

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                              ♫♪  ♪ ♫

Oct 28, 2014
#152
+106943
0

Thurs 30/10/14

1) This is a good question and answer  Thanks CPhill

2) This is a good one for junior High children   Melody.

3) This was a very active thread on limits.  Thanks Alan, Melody and CPhill

http://web2.0calc.com/questions/limits_2

4) I really like it when question askers are interactive.   Thanks Anon, CPhill and Melody.

http://web2.0calc.com/questions/is-this-correct_1

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                              ♫♪  ♪ ♫

Oct 29, 2014
#153
+106943
0

Sat 1/11/14

1) I really liked this question.

http://web2.0calc.com/questions/the-temperature-of-a-point-nbsp-nbsp-in-the-plane-is-given-by-the-expression-nbsp-what-is-the-temperature-of-the-coldest-point-in-the-pla_3

2) Trig equation.  This one is just a little different.  Thanks Alan.

http://web2.0calc.com/questions/2-cos-x-sin-x-1

3) Web2.0calc   It is always good to get lessons on useing the calc.  Thanks Geno. :))

http://web2.0calc.com/questions/how-do-you-do-int-on-this

4) This is a great area question.  I really like it!

http://web2.0calc.com/questions/a-goat-is-tied-outside-to-the-corner-of-a-shed-by-a-7m-long-rope-if-the-shed-has-the-dimensions-of-8m-by-5m-find-the-area-of-grass-to-the

5) Polar co-ordinates for complex numbers - something ese for me to wouk out.  Thanks Chris and Alan.

http://web2.0calc.com/questions/math-questions-multiple-choice

6) This proof stumped me

http://web2.0calc.com/questions/cubed-root-9-4-sqrt-5-cubed-root-9-4-sqrt-5-3

7) Similar functions - I really liked this question        Thanks Gino and Melody

http://web2.0calc.com/questions/i-can-t-access-one-of-the-questions-i-put-up-it-is-the-one-i-will-put-below

8) This one really made me think!

9) This is similar to the above one but a bit easier. Thanks Alan

http://web2.0calc.com/questions/the-function-nbsp-nbsp-satisfiesfor-all-nbsp-nbsp-nbsp-find-nbsp_1

10) Find the range of this function.   Melody

11) This function question is not difficult - just unusual

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                              ♫♪  ♪ ♫

Oct 31, 2014
#155
+106943
0

Sun 9/11/14

1) Chiurgeon Tud has graaced us with his presence.

http://web2.0calc.com/questions/inverse-functions_2

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Nov 8, 2014
#156
+106943
0

Mon 10/11/14

1) Probability combinations Thanks SevenUp

2) A touch of Physics.   Thanks SevenUp and Alan

http://web2.0calc.com/questions/physics-question_4

3) Taylor Series expansion  Thank you Alan

4) Circumscribing a triangle.  Thanks to Melody and Alan

http://web2.0calc.com/questions/pravo-hl-troj-heln-k-m-obvod-24-cm-jeho-strany-jsou-v-pom-ru-3-4-5-jak-polom-r-m-kru-nice-opsan-tomuto-troj-heln-ku

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Nov 9, 2014
#157
+106943
0

Tues 11/11/14

1) Mystery log question

2) This nonsense question created some good playtime  Thanks Happy7 and CPhill

3) Dance lessons for mathematicians   LOL

4) A bit of fun  :)

http://web2.0calc.com/questions/cphill-when-i-need-you-you-are-not-there-to-help-me

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Nov 10, 2014
#158
+106943
0

Wed 12/11/14

1) Rosala's back  Hip Hip Horray!

http://web2.0calc.com/questions/well-hello-everyone-hows-it-going-on-the-forum

2)Sometimes it pays to think a little even on simple questions   Thanks Gino

3) Matching equations to graphs   Thanks Gino    [I really want to study this some more]

http://web2.0calc.com/questions/identifying-equations

4) inverse functions  Thanks CPhill

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                              ♫♪  ♪ ♫

Nov 11, 2014
#159
+106943
0

Thurs 12/11/14

We have a rat pack back.  It is not the same pack as before, we do miss DragonSlayer554 and Zegroes and Rose98.  But still it is great to have a rat pack back again.  From my observation the new 'rat pack' includes Rosala, Tiddle, TayJay, happy7, Jillybean and Anonymous4338

Do not take offense to the term 'Rat Pack' it is a term coined by CPhill and it is most definitely a term of endearment :)))   CPhill and I both love having an active Rat Pack on the forum

The 'Rat Pack' has been taking garbage posts and turning them into chat rooms although Jillybean made this one from scratch.

http://web2.0calc.com/questions/random_1#r3

1) What fun we have here :)))

http://web2.0calc.com/questions/cphill-when-i-need-you-you-are-not-there-to-help-me#r6

2) Ratios and using tables

3) I wish I had more time ust ot think about some of these questions and answers.  Thanks Chris and Gino.

http://web2.0calc.com/questions/how-can-we-simplify-7-2014-and-calculate-the-remaining-when-divided-by-5

4) Trig - I had fun with this one.  Thanks Chris

5) solving simultaneous equations using matrices - thanks Alan.

http://web2.0calc.com/questions/how-do-you-use-an-inverse-matrix-to-solve-the-linear-system-5x-y-6-9x-2y-30

6) Fibonacci and Phi

7) Just as well Alan know how to use the calculator :)  Thanks Alan

http://web2.0calc.com/questions/i-need-to-3-equation-in-3-variable

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Nov 12, 2014
#160
+106943
0

Fri 14/11/14

1) The children have been very acive today :)  A toungue twister from Jillybean

http://web2.0calc.com/questions/how-much-could-a-wood-chuck-chuck-if-a-wood-chuck-could-chuck-wood

2) This one was interesting - and suitable for the younger children as well

3) gradient in 3 dimensions -thanks Alan

http://web2.0calc.com/questions/how-do-you-graph-and-calculate-slope-in-a-3-dimensional-graph

4) Modulus arithmetic is just another thing I need to study up on.  Thanks Heureka :)

http://web2.0calc.com/questions/7-x-mod-23-8

5) Birthday Problem.  Alan's answers are always impressive  :))

http://web2.0calc.com/questions/birthday-problem#r2

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                              ♫♪  ♪ ♫

Nov 13, 2014
#161
+106943
0

Sat 15/11/14

1) More Physics for me to learn.  Thanks Alan.

2) This is a repeat from yesterday but chris added a method that I really liked. :)

3) One for the little kids

http://web2.0calc.com/questions/g-39-75-what-is-this-anwer

4) A touch of physics  Thanks SevenUp

http://web2.0calc.com/questions/frictionless-curvehttp-www10-0zz0-com-2014-11-14-18-121245252-png

5,6) Functions of functions - these often confuse students - Thanks CPhill

http://web2.0calc.com/questions/math-help_49

http://web2.0calc.com/questions/help-me_33

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                              ♫♪  ♪ ♫

Nov 14, 2014
#162
+106943
0

Sun 16/11/14

1) Partial fractions - I haven't seen these on the forum before.  CPhill and Melody

http://web2.0calc.com/questions/partial-fractions

2) Introduction to algebra.

I have added this one to Reference material because if may be worth using again.

3) some mind boggling Trig stuff   Thanks CPhill

http://web2.0calc.com/questions/solving-these-mindboggling-trig-stuff

4) finding the present value of a bond (I have added this to the 'great answers to learn from' sticky post)

http://web2.0calc.com/questions/valuation-corporate-bond_1

5) How time and angles are related to each other.  Thanks Brittany, Chris and Melody

6) This function one looks interesting.  Thanks Chris

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                              ♫♪  ♪ ♫

Nov 15, 2014
#163
+106943
0

Mon 17/11/14

1) Let's end the day with a laugh  Thanks Roasla.

http://web2.0calc.com/questions/let-s-end-the-day-with-a-laugh_4

The next 3 CPhill brought to my attention.  Thanks Chris

2) Interesting co-ordinate geometry question.  Thanks Alan

http://web2.0calc.com/questions/let-nbsp-nbsp-and-nbsp-nbsp-be-real-numbers-where-nbsp-and-let-nbsp-nbsp-and-nbsp-the-line-nbsp-nbsp-meaning-the-unique-line-that

3) Great ratio / geometry question.     Thanks Alan

http://web2.0calc.com/questions/if-one-of-the-legs-of-a-certain-right-triangle-is-three-times-the-other-in-what-ratio-does-the-altitude-on-the-hypotenuse-divide-the-hypote

4) Chris asked me to check this one out and i haven't even looked at it yet.  Shame on me. Thanks Chris and Alan

http://web2.0calc.com/questions/find-all-points-nbsp-nbsp-that-are-13-units-away-from-the-point-nbsp-nbsp-and-that-lie-on-the-line-nbsp-nbsp#r2

5,6) This 'functions' one looks interesting  Thansk Alan and heureka

http://web2.0calc.com/questions/yay-questions-thanks-guys

7) I liked this simple little question.

http://web2.0calc.com/questions/if-2-x-3-and-3-y-4-then-the-range-of-x-y-is

8) I struggled with this function - I am sure it should be done in a more 'organised' way

http://web2.0calc.com/questions/the-graph-of-nbsp-nbsp-is-shown-below-assume-the-domain-of-nbsp-nbsp-is-nbsp-nbsp-and-that-the-vertical-spacing-of-grid-lines-is-the-sam

9) Complex numbers - thanks Heureka and Alan

http://web2.0calc.com/questions/how-to-conert-rectangle-form-to-polar-form

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Nov 16, 2014
#164
+106943
0

Tues 19/11/14

1) This trig one amused me - it will no doubt amuse me more when Geno explains himself.

http://web2.0calc.com/questions/sin-105-sin-15

2) this sum and product of the real roots of a polynomial created some interest. Thanks CPhill and Heureka

http://www.mathsisfun.com/algebra/polynomials-sums-products-roots.html

3) Heureka's answer to this co-ordinate geometry question looks interesting.  I answered it too.  We used very different techniques.  Thanks Heureka :)

http://web2.0calc.com/questions/find-the-value-of-nbsp-x-nbsp-such-that-the-area-of-a-triangle-whose-vertices-have-coordinates-6-5-8-2-and-x-11-is-15-square-units

4) Why are these answers different?   Thanks Heureka and Happy.

http://web2.0calc.com/questions/sin-12-12-14

5) Another trig question that created a lot of interest.  Thanks Geno, Melody and Heureka

http://web2.0calc.com/questions/sin-105-sin-15

6) Pyramid left us a new 'puzzle' to think about.   Thanks Pyramid

http://web2.0calc.com/questions/probability-puzzles#r67

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                              ♫♪  ♪ ♫

Nov 17, 2014
#165
+106943
0

Wed 19/11/14

1) A look at imaginary numbers - powers of i

http://web2.0calc.com/questions/imaginary-and-complex-numbers

2) Equation with logs - Just a little different.

3) I really like JonesDaBoi's answer here - Thank you.

http://web2.0calc.com/questions/linear-word-problem

4) Integrating log functions   Thanks Heureka

http://web2.0calc.com/questions/how-to-find-integral-of-logarithmic-functions

5) The calculator outputs on this question are puzzling me.    Thanks Heureka and happy7

http://web2.0calc.com/questions/sin-12-12-14

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                              ♫♪  ♪ ♫

Nov 18, 2014
#166
+106943
0

20/11/14

1) The children had a 'poetry fight' this morning

http://web2.0calc.com/questions/poetry-fight-trust-me-i-m-evil

And CPhill, we no longer have a 'rat pack' we now have a 'wolf pack' and a the leader of the pack, at present, is SPIRITWOLF.  It is good for the forum to have its own pack of wolves.

2) I liked Geno's answer here.  Thanks Geno

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Nov 19, 2014
#167
+106943
0

21/11/14

1) The second indice question was a good one   Thanks Melody and Geno

http://web2.0calc.com/questions/can-anyone-tell-me-what-are-the-steps-for-this

2) These trig ones often create confusion

http://web2.0calc.com/questions/what-will-be-the-value-of-cot-sin-inverse-1-3

3) I always like it when I see Chris playing with the kids. Although I suspect that Brittany is more of a young lady than a child.

4) I liked this scientific notation question.  We were not being asked just to DO a question.  There was a proper 'trying to understand' question behind it.  Thanks anon.

http://web2.0calc.com/questions/3-00-x-10-8-6-50-x-10-7-the-result-is-4-61-x-10-14-my-question-is-how-10-8-10-7-10-14-thank-u

5) Review of complex numbers  cartesian to palar co-ordinants.

http://web2.0calc.com/questions/how-to-do-complex-calculation_1

http://web2.0calc.com/questions/3x-2-2x-1-0_1

7) I like this physics question but either Chris or I suffered a brain freeze LOL

http://web2.0calc.com/questions/gravity

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Nov 20, 2014
#168
+106943
0

Sat 22/11/14

There were many questions that did not get answered properly today - many but not of them were probablility.   I collected the address and put them in this thread.

1) I liked this little physics question.  Thanks Alan

http://web2.0calc.com/questions/calculate-the-pressure-caused-by-an-elephan-whos-mass-is-80000-n-the-area-of-each-foot-is-0-25m#r1

2,3) More good modular arithmetic ones to work through.  Thanks Alan & Heureka

http://web2.0calc.com/questions/what-are-the-last-2-digits-of-7-2800#r3

http://web2.0calc.com/questions/evaluate30-mod-899#r2

4,5,6) A couple of  good little probability question.  Thanks Melody and CPhill.

http://web2.0calc.com/questions/if-you-have-a-deck-of-cards-and-you-draw-2-red-cards-how-big-is-the-chance-of-the-following-three-being-red-cards#r4

http://web2.0calc.com/questions/what-is-the-probability-that-7-people-can-seat-with-a-certain-3-people-not-in-a-consecutive-order

7) Wolf pack logic

http://web2.0calc.com/questions/how-do-you-get-a-giraffe-in-a-fridge

8) Up and coming mathematicians should try and remember the factorisation for sum and diff of two cubes. Thanks Heureka

http://web2.0calc.com/questions/factoring_15

9) Gambling expectation - I don't know how to do these, can someone help?

http://web2.0calc.com/questions/if-a-person-rolls-two-dice-and-obtain-a-sum-of-2-or-12-he-wins-15-find-the-expectation-of-the-game-if-the-person-pays-5-to-play

10) Another probablity but it is a little different.

http://web2.0calc.com/questions/the-probability-that-a-family-visits-the-sand-crab-water-park-and-the-rainbow-gardens-amusement-park-is-0-20-the-probability-that-a-family

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Nov 21, 2014
#169
+106943
0

Sun 23/11/14

Finding percent of a number (or money)

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Nov 22, 2014
#170
+106943
0

Mon 23/11/14

1) Probability   Thanks Geno and anon.

http://web2.0calc.com/questions/hypergeometric-distribution

2) I was doing a gaussian elimination in the Spanish forum and look what I found.  Geno probably know it is there. He uses lots of great 'calc' aids.

http://www.gregthatcher.com/Mathematics/GaussJordan.aspx

3) Exponential growth - Thanks Chris

http://web2.0calc.com/questions/the-count-of-bacteria-in-a-culture-was-800-after-10-minutes-and-1800-after-40-minutes-what-was-the-initial-size-of-the-culture

4) An interesting Co-ordinate geometry question.  Thanks Chris.

http://web2.0calc.com/questions/the-line-segment-joining-p1-0-5-and-p2-4-1-is-extended-beyond-p1-to-pr-so-that-pr-is-4-times-as-far-from-p2-as-from-p1-find-the-coordi

5) So that is what a Taylor Series is.         Thanks Alan

http://web2.0calc.com/questions/how-do-you-expand-a-log-function

6) Greatest common factor - looks interesting  Thanks Geno, Chris and Heureka

http://web2.0calc.com/questions/what-is-the-greatest-common-factor-of-1134218-and-1135620

7) This was a popular puzzle - Thanks for posting it Archie

http://web2.0calc.com/questions/puzzel

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                              ♫♪  ♪ ♫

Nov 23, 2014
#171
+106943
0

Tues 24/11/14

1) Fun with complex numbers - two different solution methods

http://web2.0calc.com/questions/precalculus-question

2) Simultaneous equations.  Chris was very complimentary of Heureka's method.   Thanks Chris an Heureka

http://web2.0calc.com/questions/a-plus-b-equals-1-a-squared-plus-b-squared-is-2-what-is-a-cubed-plus-b-cubed

3) Deriving a parabola equation from a graph.   Thanks Chris.

4) Is this huge number divisable by 5?  Two approaches.  Thanks Melody and Heureka

http://web2.0calc.com/questions/is-46-78-89-67-dividable-with-5

5) Binomial expansion with fractional power.  I've seen this before (by Bertie) but i have never actually used it.  Thanks Alan

http://web2.0calc.com/questions/write-as-a-series-in-ascending-powers-of-x-as-far-as-the-term-in-x3-and-state-the-values-of-x-for-which-the-expansion-is-valid-root-4-x

6) A great bit of trivia - and a question as well - Finonacci sequence    Thanks Geno

http://web2.0calc.com/questions/leonardo-of-pisa-lived-in-the-13th-century-in-pisa-italy

7) A weird function question.  Geno and I got different answers.    Thanks Geno.

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                              ♫♪  ♪ ♫

Nov 24, 2014
#172
+106943
0

Wed 25/11/14

1) It is really nice when people voice there appreciations.  Thank you anons.

2) What is a logarithm.  I have added this to great answers to learn from.

http://web2.0calc.com/questions/i-m-not-actually-sure-how-to-type-this-out-so-i-took-a-screenshot-does-anyone-know-how-to-solve-this-http-prntscr-com-5a6cz7

3) This was a differentiation by first principals proof.   Thanks Melody and Alan

http://web2.0calc.com/questions/find-using-first-principles-the-derivative-of-cosx

4) When can fraction be written as a terminating decimal.  Great answer by CPhill. Thanks Chris

http://web2.0calc.com/questions/chandler-tells-aubrey-that-the-decimal-value-of-1-7-is-not-a-repeating-decimal-should-aubrey-believe-him

5) There are some advanced school calculus questions in this lot.  I was quite pleased with my answer.  Chris answered the rest.  Thanks Chris.

http://web2.0calc.com/questions/help-with-related-rates

6) Bearings and vectors   I want to have a better look at this one.     Thanks Chris

http://web2.0calc.com/questions/a-unman-airplane-drone-flies-at-a-constant-speed-of-375-km-h-at-a-bearing-of-south-83-degrees-due-east-with-a-42-km-h-crosswind-of-east-2

7) Another I'd like to look at more.   finding the domain of functions   Thanks Chris.

8) The Wolf pack were unusually active today.  Was it a full moon?

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                              ♫♪  ♪ ♫

Nov 25, 2014
#173
+106943
0

Thurs 27/11/14

1) Another limit to memorise      Thanks Alan

http://web2.0calc.com/questions/l-hopital-rule

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Nov 26, 2014
#174
+106943
0

Fri 28/11/14

1) Fractional powers of negative numbers.    Thanks Alan

2) Integration by parts - 3 times!          Melody

http://web2.0calc.com/questions/integral-of-xe-square-root-of-x-dx#rr1

3) Imaginary pronumerals - I really liked this little joke  Thanks anon

4) Electronic force acting on particals   Thanks Alan

http://web2.0calc.com/questions/three-charged-particles-are-placed-at-each-of-three-corners-of-an-equilateral-triangle-whose-sides-are-of-length-3-1cm-two-of-the-particle

5) More limits       Thanks Alan

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Nov 27, 2014
#175
+106943
0

Sun30/11/14

1) Beal's conjecture     Thanks TakahiroMaeda.

http://web2.0calc.com/questions/states-that-the-only-solutions-to-the-equation-a-x-b-y-c-z-when-a-b-and-c-are-positive-integers-and-x-y-and-z-are-positive-integers

2) Ellipse facts

3) Water displacement - I like questions like this :)    Thanks Chris

http://web2.0calc.com/questions/a-marble-is-dropped-into-a-cylindrical-beaker-of-water-the-beaker-is-10-cm-tall-though-the-water-only-comes-up-to-6-cm-mark-and-has-a-base

4) Trig curve sketching - this continues to cause lots of confusion.

http://web2.0calc.com/questions/solve-for-a-and-b

5) Difficult area of a triangle question - Thanks Alan

http://web2.0calc.com/questions/2-neigbouring-triangles-with-no-right-angles-with-very-little-information-find-the-area-of-them-combined_1

6) 3 mathematicians -3 different answers  LOL      (Thanks Melody, CPhill and Geno3141)

http://web2.0calc.com/questions/a-parallelogram-has-sides-of-12cm-and-8cm-the-distance-between-the-12cm-sides-is-4cm-find-the-distance-between-the-8cm-sides

7) Another one with multiple answers.  We need some arbitration here. :)     (Thanks Melody and CPhill)

8) What is this number i

http://web2.0calc.com/questions/how-does-the-sqaure-root-of-1-i

9) I always like these and this one is not too difficult.  Speeds, with and without the current. Thanks NathanDeAlian and Melody.

http://web2.0calc.com/questions/how-would-i-begin-the-equation

10) This one was from yesterday but Alan has given us another answer today.  Thanks Alan.

http://web2.0calc.com/questions/integral-of-xe-square-root-of-x-dx

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Nov 29, 2014
#176
+106943
0

Mon 1/12/14

1) Graphing equations by layering. I made that term up but it does describe the process. There is probably  proper word.

This question actually laid around unanswered for aa couple of days but it is a good question.

2) Speed/time question - I always like these   Thanks Chris and Melody

3) One of these days i am going to learn some Physics off Alan - He makes it look easy LOL  Thanks Alan.

http://web2.0calc.com/questions/system-of-blocks

4) Area of a triangle - not straight forward   Thanks Alan

http://web2.0calc.com/questions/2-neigbouring-triangles-with-no-right-angles-with-very-little-information-find-the-area-of-them-combined_1

5) Quadratic equation.  Easy but could throw some people. Thanks Chris

6)  Population Growth   Thanks Heureka

http://web2.0calc.com/questions/a-c-ountrys-population-in-1991-was-231-million-in-1999-it-was-233-million-estimate-the-population-in-2003-using-the-exponetial-growth-form

7)  A number problem.   good for the younger children.  You may need a little algebra.     Thanks Chris.

http://web2.0calc.com/questions/a-book-is-open-and-the-product-of-the-facing-page-number-is-1056-what-are-the-page-numbers#r1

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Nov 30, 2014
#177
+106943
0

Tues 2/12/14

1) Rosala's Laughs     Thanks Rosala

http://web2.0calc.com/questions/let-s-laugh-after-ages#r4

2) Good bit of math trivia.  Thanks Geno

3) Another current (rates) question    Thanks Chris

http://web2.0calc.com/questions/sailing-with-the-current-a-boat-takes-3-hours-to-travel-48-miles-the-return-trip-against-the-current-takes-4-hours-find-the-average-spe

4)  Inverse cotangent    Thanks Geno

http://web2.0calc.com/questions/how-do-you-use-inverse-cotangent

5) Simultaneous Equations   Heureka has STYLE  No one could say otherwise.  Thanks Heureka

http://web2.0calc.com/questions/there-are-35-rabbits-and-birds-combined-in-one-cage-there-are-94-legs-in-the-cage-how-may-rabbits-and-how-many-birds-are-there

6) Physics - Mmm  (Thanks Alan and anon)

http://web2.0calc.com/questions/a-how-high-a-hill-can-a-car-coast-up-engine-disengaged-if-friction-is-negligible-and-its-initial-speed-is-nbsp-96-0-nbsp-km-h

7) There is always room for a little joke  Thanks anon

http://web2.0calc.com/questions/why-was-math-easy-for-the-romans-because-x-is-always-10

8) These simultaneous equations (circle and line) attracted a lot of interest. Thanks Alan, anon and Heureka

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Dec 1, 2014
#178
+106943
0

Wed 3/12/14

1) Great fun thread  and Brittany introduces herself properly :)  Thanks Happy7 and BrittanyJ

http://web2.0calc.com/questions/this-is-me

2) Concentrations  and equations.  I liked this one.

http://web2.0calc.com/questions/3-x-x-3

4) Permutations   Thanks Geno

http://web2.0calc.com/questions/how-many-distinguishable-permutations-of-letters-are-possible-using-the-letters-in-the-word-committee

5) Probability    Thanks to me.

http://web2.0calc.com/questions/winning-the-jackpot-requires-that-you-select-the-correct-five-numbers-between-1-and-56-and-in-a-seperate-drawing-you-must-also-select-the

6) There is more than one way to solve a problem.    Thanks Geno and Heureka

http://web2.0calc.com/questions/do-theese-3-points-lie-on-the-same-lines-4-2-2-2-5-8-7-or-10-4-3-2-8-17-6-8-pleeeease-respond

7) This determine the function promoted interest.  Thanks Heureka, Mathematician and Geno.

http://web2.0calc.com/questions/whats-the-rule-for-my-table

8) Using substitution to make equations easier to solve.  Thanks Alan

http://web2.0calc.com/questions/x-3-sup2-y-3-sup2-5

9) Infinity times 0      Thanks Geno and Heureka

http://web2.0calc.com/questions/whats-x-0#r1

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Dec 2, 2014
#179
+106943
0

Thurs 4/12/14

There were many polynomial questions today (which is very unusual), I collected all the addresses and put them in this post.

http://web2.0calc.com/questions/polynomial-questions#rr0

1) I liked Brittany's little joke

http://web2.0calc.com/questions/if-i-have-87-5-how-much-is-one-worth-for-87-5#r2

2) Senior students often find the min and max word problems very difficult.

http://web2.0calc.com/questions/an-inbox-tray-has-3-walls-and-an-open-side-on-one-of-the-longer-sides-determine-the-maximum-area-of-the-tray-if-all-three-walls-total-to-a

3) Here is another of Heureka's masterpeices.  Thanks Heureka

http://web2.0calc.com/questions/the-polynomial-nbsp-nbsp-has-degree-3-if-nbsp-nbsp-nbsp-and-nbsp-then-what-are-the-nbsp-intercepts-of-the-graph-of-nbsp

4) Polynomial problem - Thanks Heureka

http://web2.0calc.com/questions/find-nbsp-nbsp-if-the-expansion-of-the-product-of-nbsp-nbsp-and-nbsp-nbsp-has-no-nbsp-nbsp-term

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Dec 3, 2014
#180
+106943
0

Fri 5/12/14

1) Finding polynomial coefficient.  Another masterpeice.    Thanks Heureka

http://web2.0calc.com/questions/what-is-the-coefficient-of-nbsp-nbsp-in-nbsp_1

2) Calculus  Thanks Heureka and Anon

http://web2.0calc.com/questions/derivative-of-tan-x-y

3) Another factorisation 'tip' for a cubic that has come in handy - Thanks Heureka

4) trig equation

http://web2.0calc.com/questions/simplify-the-following-expression-cos-acos-2-x-asec-x

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Dec 4, 2014
#181
+106943
0

Sat 6/12/14

1) A little riddle   Thanks Happy and anon

2) I liked this one - Sorry Chris I just could not resist  :)

http://web2.0calc.com/questions/rebeccas-problem

3)  Most of the time imaginary numbers behave just like real numbers do.   Thanks Alan

http://web2.0calc.com/questions/can-you-help-me_3

4) I don't understand this one but it looks interesting.   Thanks Alan

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Dec 5, 2014
#182
+106943
0

Sun 7/12/14

1) This one is great - calc the 5th root of 2 with a very simple calculator - Thanks anon :)

(Suitable for all high school children - at a push anyway)

2) This was a fun challenge       Thanks Alan and Melody

http://web2.0calc.com/questions/inverse-trig-functions-derivative

3) I like these   Thansk Alan

http://web2.0calc.com/questions/rational-exponents_1

4) Anon said what I was thinking but Alan's answer is really neat.  Thanks to each of you :)

http://web2.0calc.com/questions/integrals

5) This was a bit of a challenge - I hope i didn't make any mistakes.

http://web2.0calc.com/questions/a-b-deposits-m-100-into-a-bank-account-the-bank-credits-interest-at-nominal-annual-rate-j-convertible-semiannually-for-the-first-seven

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Dec 6, 2014
#183
+106943
0

Mon 8/12/14

Example of how a question shoiuld be reposted if it is not answered and it is not onthe first page anymore.

1) Rosala sharted her heritage walk with us.

http://web2.0calc.com/questions/lets-end-the-day-with-amusement

2) I really like Chris's solution to this trig limit.

http://web2.0calc.com/questions/lim-t-0-tan-12t-sin-4t

3) Another not so difficult polynomial question - Thanks Chris

4) Some difficult trig integration.   (Alan and Melody and CPhill)

5) Volume of a sphere - A really interesting analyis by fiflvm97 and CPhill.

http://web2.0calc.com/questions/what-is-the-volume-of-a-sphere

6) Repeating and terminating decimals.  Thanks Chris, I shall try to remember.

http://web2.0calc.com/questions/is-1-17-a-repeating-or-terminating-decimal

7)  Finding the lowest common multiple (LCM)   Melody

http://web2.0calc.com/questions/what-is-the-lowest-common-multiple-of-2x3-2x5-4x7-and-750

8) Area problem  Thanks Chris

http://web2.0calc.com/questions/area-problem_2

9)  $$\mbox{A look at the restrictions on }\sqrt{a} \times \sqrt{b}=\sqrt{ab}$$   Thanks GoldenLeaf, Anon, Melody and Alan

http://web2.0calc.com/questions/what-is-the-domain-of-the-formula-square-root-of-a-square-root-of-b-square-root-of-ab

10)  Advanced Statistics Questions   Thanks  Melody and Alan

http://web2.0calc.com/questions/bio-statistics#r1

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Dec 7, 2014
#184
+106943
0

Wed 10/12/14

1) Happy's tribute to many on the forum.  Thanks Happy

http://web2.0calc.com/questions/thank-you-to-everyone-who-makes-this-site-truly-awesome

2) Zegroes is back :)

4) A discussion of chance.   Thanks Chris

http://web2.0calc.com/questions/what-are-the-odds-of-losing-6-coin-flips-in-a-row

5) these require a little thought - thanks Chris

6) I enjoyed this clip.  I thought you might too.

http://web2.0calc.com/questions/is-the-earth-actually-flat

7) Which fraction is bigger?      Thanks Chris and Alan

http://web2.0calc.com/questions/compare-which-one-is-bigger

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Dec 9, 2014
#185
+106943
0

Thurs 11/10/14

1) SevenUp tells us we can expect a play

http://web2.0calc.com/questions/what-s-9-10-5-8

2) I should give this one some thought.  Thanks Heureka

3) I great gif illustration of pi - Thanks flfvm97

http://web2.0calc.com/questions/what-is-pi_26

4 & 5) Exponential Growth   Thanks Alan

http://web2.0calc.com/questions/a-culture-started-with-2-000-bacteria-after-4-hours-it-grew-to-2-200-bacteria-predict-how-many-bacteria-will-be-present-in-9-hours-round

6) This equation looks interesting       Thanks Chris

http://web2.0calc.com/questions/solve-the-equation-and-find-the-roots-x-4-3-x-2-3-8-0

7) Simplifying complex numbers.       Melody and Chris

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Dec 10, 2014
#186
+106943
0

Fri 12/11/14

1) This is hilarious.  Thanks happy.

http://web2.0calc.com/questions/i-ll-fix-mistakes-with-a-laugh#r4

2) I thought this was a good bit of light fun too.

http://web2.0calc.com/questions/how-does-an-apple-eat-10-apples-if-an-apple-is-one-apple

3) Vectors.  Thanks Heureka

http://web2.0calc.com/questions/question-on-mechanics-vectors

4) This one looks really interesting  - CPhill bought it to my attention.   Thanks CPhill and Geno

5) A great peice of 'trivia', can I say that?   Thanks Gino :))

http://web2.0calc.com/questions/why-1-1-2

6) Here is something that I have not seen before.  Thanks Gino and anon :)

http://web2.0calc.com/questions/what-is-2-tetrated-1-times

7) It seems flflvm97 is going to give us 'challenge questions'  This one does look intersting.

I don't find enough time to even answer 'real' questions.   Nevermind Chris found the time.  It (the time) must have been under his bed.  That is where you can find everything.

http://web2.0calc.com/questions/flflvm-s-daily-question-day-2

8) Make x the subject in a quadratic. I liked this one :)

http://web2.0calc.com/questions/assigning-var#rr1

9) This puzzle question from flflvm97 created interest.  We have had it berfore I am sure but if I can't find it in our puzzles I will add it.  I have given it the green puzzle symbol.  Thanks flflvm97

http://web2.0calc.com/questions/flflvm-s-daily-question

10) Physics - Is  the weight of a ball relevant to high high it will bounce? Why, Why not?

Thanks to Melody and flflvm97and especially Alan

http://web2.0calc.com/questions/physics-and-maths-stuff

11) Number puzzle - suitable for everyone.

http://web2.0calc.com/questions/what-would-the-equation-be-to-a-solution-equaling-39-if-you-use-the-digits-1-9-8-2

12) Riddle - Nothing like a good riddle :)  Thans anon and Happy

http://web2.0calc.com/questions/riddle-5

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Dec 11, 2014
#187
+106943
0

Sun 14/12/14

1) Calculus, chain rule

2) Jillybean asked me to draw special attention to this clip.  Thanks Jillybean

http://web2.0calc.com/questions/take-a-stand

3) How scaling a side length effects surface area and volume.

4) Vectors  Thanks Chris

http://web2.0calc.com/questions/an-airplane-is-flying-at-500-km-hr-at-an-angle-of-310-degrees-the-wind-is-blowing-at-45-km-hr-at-an-angle-of-225-degrees-what-is-the-resul

5) How long to cool?   Thanks Chris

http://web2.0calc.com/questions/pies-can-only-be-delivered-when-their-temperature-is-120-degrees-when-they-are-taken-out-of-the-oven-after-two-minutes-their-temperature-is

6) What is pi plus and what is a cyloid.      Thanks anon, Melody and Chris.

http://web2.0calc.com/questions/what-does-pi-equal_1#rr4

7 & 8) Simplifying roots

http://web2.0calc.com/questions/sqrt-a-2sqrt-a-4-5-7-sqrt-a-5

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Dec 13, 2014
#188
+106943
0

Mon 15/12/14

1) I liked Nauseated's answer to this one - it was funny.  Thanks Nauseated.

http://web2.0calc.com/questions/connie-s-dog-fido-weighs-35-pounds

2) Astronomy, physics, calculus, integration by parts and spherical shells.    Thanks Alan

What a great question and answer.

3) How can parents help children to understand fraction concepts?

4) I liked this one. Thanks Geno

5) Absolutes with inequalities can be quite tricky.  Thanks Geno

http://web2.0calc.com/questions/what-values-of-nbsp-nbsp-satisfy-nbsp-nbsp

6) Another absolute value question.  Looks difficult.  Thanks Geno

7) An unusual log question.  Thanks Geno

8) This is a real answer - not very polite - but real.   Thanks Nauseated. (I think)

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Dec 14, 2014
#189
+106943
0

Tues 16/12/14

1) flflvm97's daily logic puzzle -  Thanks flflvm97

http://web2.0calc.com/questions/flflvm-s-daily-question-day-4

2 and 3) Perfect squares   Thanks Melody and Chris

http://web2.0calc.com/questions/can-someone-explain-this-to-me

4) Convert a polar equation to a cartesian equation.   Thanks Chris

http://web2.0calc.com/questions/convert-the-polar-equation-r-3cos-theta

5) Rearranging a circle equation  Thanks Chris

http://web2.0calc.com/questions/how-do-i-get-the-circle-equation-x-y-10x-5y-25-in-terms-of-y

6) What is an oboe?

http://web2.0calc.com/questions/does-anyone-else-play-oboe

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Dec 15, 2014
#190
+106943
0

Wed 17/12/14

1)  Mathhelpneeded messaged this to me.

"Happy7 and CPhill are incredible!  I want you to add this in your wrap."

Thanks Mathhelpneeded.  It makes our day when people show their appreciation.  Happy7 and CPhill will be chuffed (very pleased).

2)  This is a good one for a bright 13/14 year old

http://web2.0calc.com/questions/if-a-triangle-s-base-is-8-and-its-height-is-6-less-than-its-area-then-the-area

3)  Understanding Calculator output

4)  Manilupating complex (imaginary) numbers.        Thanks Chris

http://web2.0calc.com/questions/the-product-of-12-34i-and-12-34i-divided-by-2-3i-is

5)  Manipulating Fractions. A great answer from saseflower.  Thanks saseflower

http://web2.0calc.com/questions/how-to-do-fractions_1

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Dec 16, 2014
#191
+106943
0

I think that one of the most positive things about this site is that it allows a little culture exchange.

I find other people's cultures very interesting to learn about and the interaction also helps make people of the world a little more understanding and tolerant of each other.

CPhill expressed these same sentiments today when he bought my attention to this post.

http://web2.0calc.com/questions/why-is-the-sky-purple#r4

Thursday 18/12/14

1) Puzzle question - an old one but a good one - Thanks Daisy  :)

2) I liked the explanation that I gave for this simple equation.

http://web2.0calc.com/questions/solving-a-simple-equation

3) Two techniques - one problem.        Thanks Gino and Chris

http://web2.0calc.com/questions/translate-into-an-algebraic-equation-and-solve-find-three-consecutive-odd-integers-such-that-the-difference-between-four-times-the-first-in

4) Equation with absolute values     Thanks Geno and Chris.

http://web2.0calc.com/questions/math-question_62

5) Simplifying logs   Thanks Geno

6) A touch of physics.     Thanks Alan

http://web2.0calc.com/questions/an-object-is-accelerating-uniformly-from-8-0-m-s-to-16-m-s-in-10-seconds-how-far-does-the-object-travel-in-10-seconds

7) It is really good to learn how graphs transform.  This is a 'starter example'     Thanks Chris

http://web2.0calc.com/questions/how-are-y-x-3-and-y-x-3-3-the-same-how-are-they-different

8) Imaginary numbers are interesting and rather strange.  Thanks Alan

http://web2.0calc.com/questions/how-do-you-represent-the-twelfth-root-of-unity-graphically-then-obtain-approximations-of-it-in-the-form-a-bi-for-each-root

9) A fun little indice question

http://web2.0calc.com/questions/6j-2-3

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Dec 17, 2014
#192
+106943
0

Fri 19/12/14

It is CPhill's bithday today - Happy birthday Chris  :)))

http://web2.0calc.com/questions/happy-birthday-cphill

Modulus arithmetic (Thanks Anon, Geno and Melody)

Find all answers to   $$\sqrt[12]{1}$$    I really like Alan's answers.  Thanks Alan

http://web2.0calc.com/questions/how-do-you-represent-the-twelfth-root-of-unity-graphically

Finding the x and y intercepts of a line     Thanks GoldenLeaf and Melody

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Dec 18, 2014
#193
+106943
0

Sat 20/12/14  NOTHING

Sun 21/12/14

It is DragonSlayer554's birthday.

You have not been able to be with us for a long time but your friends here have not forgotten you.

We wish you a wonderful day

http://web2.0calc.com/questions/happy-birthday-dragon-slayer-554

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Dec 19, 2014
#194
+106943
0

Mon 22/12/14

1)  Great Puzzle - We always like puzzles to be shared.  Thanks Anon and Geno.

http://web2.0calc.com/questions/here-is-a-riddle-that-i-ve-heard-long-time-ago

2)  I did like CPhill's fun answer here.  Thanks Chris.

http://web2.0calc.com/questions/how-many-people-can-i-feed-with-3-pounds-of-fudge

3)  Chrismas Songs - Jillybean would like you to share your favourite christmas songs with her.

Thanks Jillybean and Chris.

http://web2.0calc.com/questions/holiday-songs

4)  Physics - Thanks Nauseated but you do not seem to sure of your answer. I wonder if it is correct?

5)  Physics - Thanks Alan

http://web2.0calc.com/questions/physics_70#r1

6)  A really good indice answer.   Thanks anon

http://web2.0calc.com/questions/0001-raised-to-25-power

7)  The trig bearings question really tested my abilities with geogebra.  It is a good question too.

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Dec 21, 2014
#195
+106943
0

Tues 23/12/14

Linear equation - Just a little different.  Thanks Geno

Vectors    Thanks Alan

http://web2.0calc.com/questions/how-do-i-calculate-this-d-c-dot-vec-bc-vec-ab-vec-ab-vec-ab-2

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Dec 22, 2014
#196
+106943
0

Wed 24/12/14      NOTHING

Thurs 25/12/14

Divisability tests.   This is a really good for younger children (and older ones if they don't already know it)  Thanks Chris.

http://web2.0calc.com/questions/which-of-the-following-numbers-are-divisible-by-2-4-6-and-8-174-316-472-552

CPhill and I did this 2 different ways and got the same answer.  hanks CPhill.

http://web2.0calc.com/questions/find-the-number-of-subsets-12-0-12-13-14

I want to give this puzzle a go but I still have not done so.

http://web2.0calc.com/questions/here-is-a-puzzle

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Dec 23, 2014
#197
+106943
0

Fri  26/12/14

Sat 27/12/14

Transitive Property - A new one for me - Thanks Alan

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Dec 25, 2014
#198
+106943
0

Sun 28/12/14

1) Here is one for middle level trig students to have a go at - I have not actually finished it.

http://web2.0calc.com/questions/3-sin-2x-3-1-2-sin-2x

2) Simplifying indices - they can be messy

http://web2.0calc.com/questions/can-you-solve-this

3) Area ratio of inscribed to circumscribed circles - Thanks Alan

http://web2.0calc.com/questions/square_1

4) Unusual area question

5) Another great length question. - Great pre-runner to calculus   :)

http://web2.0calc.com/questions/wirea-piece-of-wire-of-length-50-m-is-cut-into-two-parts-each-part-is-then-bent-to-form-a-square-it-is-found-that-the-total-area-of-the-sq#rr1

6) I like this difference of 2 squares question because I like how rosala always tells us when she does not understand our explanations.  Thanks rosala

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Dec 27, 2014
#199
+106943
0

Mon 29/12/14

The first four were all suggested by CPhill. I am always pleased when people request interest posts to be included.  Thanks Chris

1)  Simplifying indices - A pretty cool question

2) An interesting co-ordinate geometry question.   Thanks to Melody and Chris

http://web2.0calc.com/questions/equation-to-circles

3) An interesting trapezium area question.  Thanks Chris

http://web2.0calc.com/questions/a-trapezoid-6m-in-altitude-have-bases-of-12-m-and-18m-respectively-if-the-it-is-divided-into-two-parts-by-a-line-parallel-to-the-bases-suc

4) Finding the 4th side of a quadrilateral that is circumscribed by a circle. Thanks Melody and Chris

5) finding root using secant method.   Thanks Alan

http://web2.0calc.com/questions/find-the-roots-of-the-equation-x2-4x-5-0-the-secant-method

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Dec 28, 2014
#200
+106943
0

Tues 30/12/14

1)  How do you change different base numbers to base 10 ?  In this case base 2.  Thanks Gino

http://web2.0calc.com/questions/110100101

2)  A simple but important concept for our younger followers  Thanks Geno

http://web2.0calc.com/questions/3-4-divide-by-2

3) Geno answered lots of great geometry questions - most related to rhombuses.  This one didn't

Thanks Geno.

http://web2.0calc.com/questions/the-angles-between-the-diagonals-of-a-rectangle-is-30-degrees-and-each-diagonal-is-12-cm-long-find-the-area-of-the-rectangle

4)    What is Phi ( φ )?       Thanks Chris

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Dec 29, 2014
#201
+106943
0

Wed 31/12/14

Thurs 1/1/15

Merriment wishes for the new year

Fri 2/1/14

Polar co-ordinates.  Thanks Geno

http://web2.0calc.com/questions/what-are-the-polar-coordinates-of-5-6

Differential Equation.  Thanks Chris and Geno

Explaining the unit circle.  Geno and Melody.

http://web2.0calc.com/questions/how-does_1

some great calculus Answers from Chris.  Thanks Chris.

Perpendicular bisector     Thanks Geno

http://web2.0calc.com/questions/find-the-equation-of-the-perpendicular-bisector-of-the-line-joining-a-2-1-b-8-3

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Dec 30, 2014
#202
+106943
0

Sat 3/1/15

1) Interesting domain question.

2) Interesting trig.  Unit circle and exact values.   Melody

3) What are permutations and combinations ?      Melody

http://web2.0calc.com/questions/how-many-possible-combinations-are-there-for-a-deck-of-cards

4) A really good rates and volume question.        Melody

5) Physics    Thanks Alan

6) Some geometry.  Chris would like someone to check his answer but he thinks it is good.  Thanks Chris.

http://web2.0calc.com/questions/the-area-of-a-rhombus-is-250-and-one-of-the-angles-is-37-deg-27-what-is-the-length-of-each-side

7) All in fun :))    NotTheBestMathMaster, Melody, Nauseated, Alan and CPhil.

8) Formula for triangular numbers  Thanks Alan and Chris

9) Parabola question, different from the norm - Thanks Alan

10) This is not a high level question but I liked it. (percantages)  :)

11) A couple of revision/learning sites suggested by Chris

12) Induction  Thanks Chris

http://web2.0calc.com/questions/math-induction

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Jan 2, 2015
#203
+106943
0

Tues 6/1/15

1) This is an old one but many people have been away on holidays and I'd really like people to read my new years message.  It is just intended as a thank you to you all.

This is the wrap address but it links to mine and Rosala's new year messages. :)

http://web2.0calc.com/questions/how-to-you-approach-solving-the-moving-sofa-problem-for-rectangles-only-but-given-hallway-widths-a-and-b-not-width-1-and-1-as-in-the-orig

3 ) Imaginary numbers     $$\sqrt[4]{-1}$$       I liked this one.

http://web2.0calc.com/questions/square-root-of-i

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Jan 5, 2015
#204
+106943
0

Wed 7/1/15

1)  Another of Heureka's masterpeices   Thanks Heureka.

2) Some Physics   Thanks Alan

http://web2.0calc.com/questions/while-playing-snowbarding-a-guy-is-going-down-a-hill-with-120-kmh-he-then-ends-at-the-flat-part-of-the-hill-and-his-speed-decreases-with-6#r1

3) This is a really good ratio and  simultaneous equations question.    Melody

http://web2.0calc.com/questions/ratio-pls-help-kinda-confuse-_

4) A simple play with imaginary numbers

http://web2.0calc.com/questions/why-is-root-3i-multiplied-by-root-3i-equal-to-3

5) Understanding logs.   Two different approaches.    Melody and CPhill

http://web2.0calc.com/questions/log-19-0-5-log-19-2-0-how-to-explain-this

6) A repeating question  LOL

http://web2.0calc.com/questions/0-999-1

7) Solve for x     Thanks Chris and Heureka

http://web2.0calc.com/questions/solve-for-x_11

8) Some basic calculus     Thanks Heureka

http://web2.0calc.com/questions/ds-dt-t-3t-2-and-s-0-when-t-1

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Jan 6, 2015
#205
+106943
0

thurs 8/1/15

1) Using Gyazo (there are other similar prgrams available if you prefer) - Good info for all levels

http://web2.0calc.com/questions/list-function

2) Puzzle probability question - Always a good one - Thanks Geno

http://web2.0calc.com/questions/suppose-you-re-on-a-game-show-and-you-re-given-the-choice-of-three-doors-behind-one-door-is-a-car-behind-the-others-goats-you-pick-a-do

3) Inverse functions  Thanks Gino

http://web2.0calc.com/questions/g-x-1-2-x-8-g-x-__________-how-do-i-writ-an-equation-for-the-inverse-of-the-function

4) Anon's answer requires more brain power than I possess right now.  Thanks CPhil and anon 1 and 2

http://web2.0calc.com/questions/how-do-i-get-60-using-7-numbers-under-20-only-using-a-number-once

5) Another to consider - Binomial expansion  Thanks Geno.

http://web2.0calc.com/questions/with-how-many-zeros-does-11-100-1-end-explain-with-binomial-theorem

6) A simple but veery important convention for everyone. Can a sqrt be negative?

http://web2.0calc.com/questions/what-are-the-different-square-roots-of-49

7) This question (from yesterday) turned into  a major interest post.  It is good when that happens.

8) Simplifying radicals - for the younger set :)   Thanks Geno

http://web2.0calc.com/questions/the-square-root-of-90-times-the-square-root-of-14-times-the-square-root-of-70

9) Exponential decay     Thanks Chris and Anon

http://web2.0calc.com/questions/a-hiker-in-africa-discovers-a-skull-that-contains-63-of-its-original-amount-of-c-14-find-the-age-of-the-skull-to-the-nearest-year-using-e

*10, 11,12 & 13)  Floor and ceiling functions.  I have included all these in great answers to learn from.

Thanks Chris

http://web2.0calc.com/questions/need-help-on-this-a-lot-thanks

http://web2.0calc.com/questions/find-all-values-of-nbsp-nbsp-such-that-nbsp-if-you-find-more-than-one-value-then-list-the-values-you-find-in-increasing-order-separated

http://web2.0calc.com/questions/let-nbsp-evaluate-this-sum-has-1000-terms-one-for-the-result-when-we-input-each-integer-from-1-to-1000-into-nbsp

http://web2.0calc.com/questions/the-function-nbsp-nbsp-is-defined-as-find-nbsp

14) Function question for younger students

http://web2.0calc.com/questions/the-function-nbsp-nbsp-is-defined-for-nbsp-nbsp-as-follows-find-all-real-numbers-nbsp-nbsp-such-that-nbsp-nbsp

*15)  This result is really weird graph.  It is a degenerate conic. It has degenerated into two cross lines.     I have included this in great answers to learn from.   Thanks Chris

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Jan 7, 2015
#206
+106943
0

Sat 10/1/14

1) Limit

http://web2.0calc.com/questions/calculus-of-a-limit

2) A Heureka Special.     Thanks reinout and Heureka

http://web2.0calc.com/questions/equation_19

3) This inverse function one gave me and Chris a headache.  LOL

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Jan 9, 2015
#207
+106943
0

Sun 11/01/14

1) Prove $${\sqrt{{\mathtt{10}}}}$$   is irrational.           Melody

http://web2.0calc.com/questions/is-the-square-root-of-ten-rational-or-irrational

2) There is more than 1 way to solve an equation.  Thanks Melody and Tetration

http://web2.0calc.com/questions/x-2-x-4-5-6-0

3) Again 2 ways to solve one equation   Thanks Chris and Alan.

http://web2.0calc.com/questions/if-x-0-what-is-the-solution-to-the-following-equation-1-x-x-2-7-x

4) Double factorial - a new one for me.       Thanks Tetration.

http://web2.0calc.com/questions/using-only-for-4s-and-any-symbol-how-can-you-make-10#r6

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Jan 10, 2015
#208
+106943
0

Mon  12/1/15

1) Factorising a quadratic using grouping method     Melody.

http://web2.0calc.com/questions/factorising

2) Suplementary and complementary and vertically opp angles.  Good for you young ones

3) Modulo Arithmetic. The link CPhill has provided looks like a nice introdution if anyone want to take a look.

It is suitable for younger ones as well as seniors.

http://web2.0calc.com/questions/modulo-operation

4) What is a grad ?    Thanks Alan

http://web2.0calc.com/questions/tan-1-1-547633313

5) These always make you think.     Thanks Geno and CPhill

http://web2.0calc.com/questions/if-2-cooks-can-prepare-25-meals-in-60-minutes-how-long-would-it-take-5-cooks

6) Why is arccos(2.3) invalid   Thanks Melody and Geno

http://web2.0calc.com/questions/why-is-arccos-2-3-an-invalid-argument

7) Complementary Trig ratios    For everyone that has done any trig.      Melody

http://web2.0calc.com/questions/sin-25-deg-cos-65-deg#rr2

8) I always like these indices questions

http://web2.0calc.com/questions/36-5-2-36-1-2------36-1-7-2

9) Using summation notation    Thanks Melody and Heureka

http://web2.0calc.com/questions/write-the-following-in-summation-notation

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Jan 11, 2015
#209
+106943
0

Wed 14/1/15

1) End your day with a Laugh.   Thanks Rosala

http://web2.0calc.com/questions/i-need-helppp-quick#r2

2) The binet formula for the fibonacci sequence.    Thanks Alan.

3) A little calculus.  Heureka beat me       Thanks Heureka

http://web2.0calc.com/questions/help-me_41

4) More calculus.    Thanks Melody and Heureka

http://web2.0calc.com/questions/trouble

5) Positive negative song contribution  Thanks Rampager1998

6) inverse functions of inverse functions.  Boggles the mind.  Thanks Chris

http://web2.0calc.com/questions/good-evening

7) Finding the fraction equivalent of a recurring decimal.     Melody

8) A fairly basic trig 360° trig question     Thanks Chris and Melody

9) Since 3 of us did this sector question I might as well include it to.  Thanks CPhill, Melody and Heureka

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Jan 13, 2015
#210
+106943
+5

Thurs 14/1/15

I stumbbled  upon some really interesting maths clips today.  You might like to take a look.

I have added this to our "reference material" Sticky topic.

1)  This one provided some entertainment.          Thanks Rosala and Chris

2) Using logs in investments      Thanks Geno

3) Weight and volume :  For everyone !     Geno, anon and Melody

http://web2.0calc.com/questions/1-kg-is-equal-to-how-many-liter

4) What is the biggest prime number.   The clip is entertaining.       Geno and Melody

http://web2.0calc.com/questions/all-prime-numbers_1

5) Finding height of a right triangle.  Thanks Rampager, Heureka and Alan

http://web2.0calc.com/questions/height-of-a-right-triangle-without-area

6) Number Pattern.       Thanks Chris and Heureka

http://web2.0calc.com/questions/whats-the-pattern-for-1-3-9-81-243

7) This looks interesting. Reflection, rotation and vectors    Thanks Heureka and Geno

8)  Why is 0!=1    This includes a really interesting video clip.    Melody

http://web2.0calc.com/questions/why-is-0-equal-to-1

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Jan 14, 2015
#211
+11885
+5

Without you this might not have been existed!

Jan 14, 2015
#212
+106943
+5

This list is normally kept invisable.  I forgot tonight.

I put all the post for the wrap in here during the day and then transfer them over when i write the wrap.

Sometimes I change them along the way of course.

"Without you this might not have been existed!"

What exactly are you referring to Rosala?

Jan 14, 2015
#213
+106532
+5

I think that rosala is saying that without you, Melody, no "Daily Wrap" would get done......

At least, not by me or rosala......we're too lazy......LOL!!!!!

Jan 14, 2015
#214
+106943
0

Thanks for the interpretation Chris.  Rosala probably did mean that. :)

Jan 14, 2015
#215
+106943
0

Fri 15/1/15

I constantly see people change mixed numeral into improper fractions for addition and subtraction and it is just not necessary.  Tetration, you have done a nice, very well presented answer here and I thank you but I would really like you and others to take a proper look at my answer.   It is always good to examine new techniques.  I get excited when I see and learn better methods to solve or teach an old problem.

http://web2.0calc.com/questions/what-is-9-3-and-1-3

1) Melody in silly mode

http://web2.0calc.com/questions/if-bob-has-two-apples-and-grace-has-three-pies-how-many-elephants-can-jumps-over-the-moon

2) Find the whole when given a percentage.  Thanks Tetration.

http://web2.0calc.com/questions/154-employees-is-7-of-what-employees

3) How long has mathematics been taught in classrooms?  Thanks Geno

http://web2.0calc.com/questions/what-was-the-first-school-to-teach-math

4) Graphical Interpretaion of proportionality.   Thanks CPhill

5) I had another crack at presenting long division with LaTex.

Heureka and I have tried this a few different ways.   Heureka's last attempt was better.

http://web2.0calc.com/questions/how-do-u-do-92-divide-6-3-in-long-division-nbsp

6) A great probability logic exercise. Great answer from Heureka, good questioning by Rosala.  Thanks

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Jan 15, 2015
#216
+106943
0

17/1/15  Sat

Here is a suggestion that may help some people keep a track of the threads that they want to follow.

End you day with a laugh.  Thank you Rosala, we always love your laughs

http://web2.0calc.com/questions/end-your-day-with-a-laugh

Fun with numbers - Suitable for everyone  Thanks Chris.

Log of complex number.  All too much for me.     Thanks Alan and Heureka.

What is a geometric mean.  Thanks Geno

http://web2.0calc.com/questions/what-is-geometric-mean_1

Using a table of values with Desmos graphing calculator.   Thanks CPhill

http://web2.0calc.com/questions/13-model-the-function-rule-y-2x-3-with-a-table-of-values-show-your-work-y-2x-3

A look at some Trig            Thanks to CPhill and Melody

http://web2.0calc.com/questions/i-have-solved-the-equation-2cos-theta-sin-theta-cos-theta-where-0-2-pi-and-got-the-solutions-pi-2-pi-6-but-my-math-textbook-has-p

Chris and I having a laugh.

http://web2.0calc.com/questions/how-do-you-write-an-equation-for-5-4-and-4-3

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Jan 16, 2015
#217
+106943
0

Sun 18/1/15

1) This is why people must learn to use brackets properly.   Thanks Tetration and Melody

2) Arithmetic sequence problem. [recommended by Chris] Thanks Chris

http://web2.0calc.com/questions/let-nbsp-nbsp-nbsp-nbsp-be-an-arithmetic-sequence-if-nbsp-nbsp-and-nbsp-then-find-nbsp#r1

3) This sum of subsets looks interesting. [recommended by Chris] Thanks Chris and Geno

4) I liked this variation on a standard trig question.   Thanks anon for the question and Geno for the answer.

http://web2.0calc.com/questions/a-plane-flies-on-a-bearing-of-065-for-200km-how-far-east-has-it-gone

5) An annoying unsolved question.     Arithmetic progression.

http://web2.0calc.com/questions/penn-writes-a-2013-term-arithmetic-sequence-of-positive-integers-and-teller-writes-a-different-2013-term-arithmetic-sequence-of-integers-t

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Jan 17, 2015
#218
+106943
0

Tues 20/1/15

1) This tricky AP question had Chris and I stumped.  Heureka came to our rescue   Thanks Heureka.

http://web2.0calc.com/questions/penn-writes-a-2013-term-arithmetic-sequence-of-positive-integers-and-teller-writes-a-different-2013-term-arithmetic-sequence-of-integers-t

2) Calculus   Melody

3) The significance of the number 666      Thanks Chris

http://web2.0calc.com/questions/any-mathematical-significance-in-666

4) Greatest common divisor    GCD     Thanks Alan

http://web2.0calc.com/questions/greatest-common-divisors-of-23-31-23-17

5) Algebraic "mixed numerals"         Melody and anon

http://web2.0calc.com/questions/fraction-question_1

6) This was a really weird AP question.  Thanks Heureka

7) Another curiosity summation   Thanks Geno and Heureka

http://web2.0calc.com/questions/find-the-sum-of-all-positive-integers-less-than-1000-ending-in-3-or-7#r8

8) Sum of sums.  Looks interesting         Thanks CPhill, Geno and Heureka

9) Another AP question   CPhill, Melody and Heureka

http://web2.0calc.com/questions/let-nbsp-nbsp-nbsp-nbsp-be-an-arithmetic-sequence-if-nbsp-nbsp-and-nbsp-then-find-nbsp#r2

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Jan 19, 2015
#219
+106943
0

Wed 21/1/15

1) I'm a dancing dinosaur  ROF LOL

http://web2.0calc.com/questions/does-anybody-wanna-do-a-happy-dance

2) I liked Chris's factor Tree.   LOL

http://web2.0calc.com/questions/factor-tree-of-200

3) Using Newton's method to solve an equation.   Thanks Heureka

4) This is a good question for the young ones.  If you multiply by a number aint the answer bigger?

Thanks anon and Chris.

http://web2.0calc.com/questions/when-you-mulltiply-a-number-aint-it-bigger-than-it-was-before

5) Great equation solution from Tetronics

http://web2.0calc.com/questions/3x-2-x-7-5-4-x-3-3-x-1

6) Simultaneous equations with exponentials   Thanks Heureka

http://web2.0calc.com/questions/an-exponential-equation-that-goes-through-3-64-and-5-1024

7) Benford's Law - The weird and the wonderful.  Thanks Chris

http://web2.0calc.com/questions/benford-s-law

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Jan 21, 2015
#220
+106943
0

Thurs 22/1/15

1)  Why isn't anyone answering our questions

2) A good trig problem.  Thanks Chris

3) Venn diagrams are fun - Thanks Chris

http://web2.0calc.com/questions/set-theory-with-venn-diagrams-and-percentages

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Jan 21, 2015
#221
+106943
0

Fri 23/1/15

CONGRATULATIONS TO HEUREKA

Heureka is now on the Top Answerers Board !!!   I am so pleased.

Heureka you are an extremely valued member of our answer team.

A puzzle      Thanks Chris

http://web2.0calc.com/questions/7-11

How you can find powers when the numbers are too big for most calculators - Thanks Geno.

http://web2.0calc.com/questions/what-is-2-4000

What is  $$-4^2$$    and why.  Lots of confusion here!   Heureka and  Melody

http://web2.0calc.com/questions/why-does-4-2-equal-16-and-not-16

What is Pascal's Triangle. A curiosity website :)   Thanks Chris

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Jan 22, 2015
#222
+106943
0

Sat 24/1/15

1) Quadratic simultaneous equation pizza problem

http://web2.0calc.com/questions/pizza-problem

2) Finding a ratio - 2 very different solutions for the same question.  I did it like Chris.  How would you tackle it?   Thanks Geno and CPhill

6) Finding a polynomial equation when given points   Thanks Chris and Alan

7) Trig   Angle of Guitar Strings    Thanks Chris

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Jan 23, 2015
#223
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Sun 25/1/15

1)   Infinite sum of a GP (with a twist)     Thanks Geno

2)   Maximum profit - Using a graph to help    Thanks CPhill and Melody

3)  Puzzle with Simultaneous equations.       Thanks CPhill and Heureka

4)  Finding the term of a GP      Thanks CPhill and Melody

5)  A good log question     Melody

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Jan 24, 2015
#224
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Mon 26/1/15

1) A challenging surd simplification.    Thanks Melody and Heureka   (Heureka's answer is better)

2) Difficult Trig Proof         Melody

3) Sum of a GP        CPhill's suggestion.   My answer.

4) Chess board number Puzzle       Thanks Chris

6) What is a hyperbolic Tangent?       Thanks for the link anon.

8) Planet velocities      Thanks   SevenUP

9) A touch more of physics    Thanks Alan

10) There are many ways to compute a sum      Heureka, Melody and CPhill

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Jan 25, 2015
#225
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Tues 27/1/15

1) Chris's retort was great - I had not heard this saying before.  Thanks Chris

2) Yesterday was also Republic Day for India!    Thanks for that info Rosala.

3) Finding the point on a line that is closest to a given circle   Recommended by Chris

Thanks Chris and Alan

4) What is the difference between tan and inverse tan?   Thanks Chris

Thanks Melody, Heureka, Alan and Chris

6) This series question looks both interesting and difficult.   Thanks Heureka

7) A touch of probablility     Thanks Alan and Melody

9) Limits    Thanks Chris and Heureka

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Jan 26, 2015
#226
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Wed 28/1/15

Simple Harmonic motion - Energy and Force    Thanks Alan

Web2 calc - Integrals and Differentials.   Thanks Alan.

How long will it take to makes shirts.  this one's easy but they can be very difficult. Thanks Melody and CPhill.

Thanks Chris, Alan, Heureka, and Melody.

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Jan 27, 2015
#227
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Thurs 29/1/15

1) The amount of money you get each day doubles - The total of what you get after a short period of time is HUGE.   Melody

2) This Series created some light hearted interest.  Thanks Alan, Melody and Heureka

3) Bearings with Trig - I always like these.  Thanks Chris

5) Parabola - this would  be a good exercise for many of you    Thanks CPhill

6) Guass method of summation   Thanks Chris and Heureka

7) This geometry one created interest. I have not checked your answers yet.

Thanks CPhill, saseflower and anons

8) This is an interesting little simultaneous equations question.   Thanks CPhill and Heureka

10)Using the discriminant with quadratic equations    CPhill and Melody

11) This inscribed triangle question is STILL attracting attention.  LOL   Thanks all mathematicians LOL

CPhill has given us a calculus solution now :)))\

12, 13)Introduction to imaginary numbers   Melody

Harder imaginary (complex) number questions.

first one       Thanks Chris         second one             Thanks Chris

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Jan 28, 2015
#228
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Friday 30/1/15

1) Some number theory by Cantor  Thanks CPhill as Saseflower.

2) Distance between 2 points with graphing and pythagoras - Thanks anon

3) A little motion physics - Thanks Alan, Heureka and Chris

4) Ice takes up more space than water.       Thanks anon and Alan

5) Complex numbers 1     Thanks Chris

6) Complex numbers 2        Melody

7) Decimal point, decimal comma        Thanks Melody and Tiddle

8) Without L'Hopital's Rule show that sin(x)/x=1     Thanks Chris and Heureka

9) Finding areas using integration    Thanks Heureka

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Jan 29, 2015
#229
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Sat 31/1/15

1) David joined in on my New Year post.     Thanks to everyone who has posted on that thread.

2) Our friendly neighbourhood troll is back.   ROF LOL   Thanks Nauseated.

3) Maths Puzzle.   Thanks anon

4) Time for a Laugh - Thanks Rosala

5) Solving an equation with logarithms.   Thanks Chris

6) Continuous functions.  Good basic understanding question and answer.     Thanks Alan

7) A touch of probablilty     Thanks Alan

8) Understanding logarithms     Thanks Chris

9) Permutation Question   Thanks Alan, DavidQD, CPhill and Melody

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Jan 30, 2015
#230
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Sun 1/2/15

Understanding factorials for beginners 2    Melody

Playing with sum of 2 cubes     Thanks CPhill, Heureka and Melody

Another tricky algebraic rearrangment.   Thanks Heureka

Very tricky simplification of surds.   Thanks CPhill

Tricky algebra manipulation.    Thanks Chris

More tricky algebraic manipulations.  Thanks Chris and Bertie.

Another very clever sequence solution.  Thanks Heureka

Continued Fractions.    Thanks CPhill and Bertie

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Jan 31, 2015
#231
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Mon 2/2/15

1) Making sense of big numbers, Indices -     Melody

2) An unusual equation problem.    Thanks CPhill.

3) Finding the exponent.     Thanks CPhill and Melody.

4) Probability.  Medium school difficulty.    Geno and I did it two different ways.

5) Interpreting polynomial graphs.     Melody

7) Distance between 2 points    Melody

8) Strange little equation question.  There were lots of these today.     Melody

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Feb 1, 2015
#232
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Tues 3/2/15

1) Awsomenes is back with some riddles.  Here is one of them. Here is another.  Thanks Awsomenes

2) Rearranging indices  (middle level)  Thanks Alan

3) Trig - Exact value      Thanks Alan

5) This trig one created some interest.  Thanks Alan and heureka

6) Simultaneous equations puzzled like question.   Thanks Mathematician and Heureka.

7) I really like this nested expansion (Is that what it should be called?)  Thanks Heureka and Chris

8) Chris has used two graphs to estimate the solutions to an equation.  This is a great concept skill.  Thanks CPhill

9) Deriving Phi    Thanks Chris.

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Feb 2, 2015
#233
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Wed 4/2/15

1) A riddle thanks Happy

2) Find equation of circle.   Thanks CPhill and Heureka

3) Integration.  We don't get many integrations.  Thanks CPhill and Heureka

4) Complex (Imaginary) numbers using Cosh.  Thanks Alan

5) Area Question - A good one for the youngsters to try.     Thanks Trincent and Chris

8) What does a hill grade of 8% mean?   Thanks CPhill.

9) Trig for senior school students to ponder.     Melody (awaiting verification)

10) Word problem.  This was an exercise on making one sort through the words to find what is relevent.  Melody

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Feb 3, 2015
#234
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Thurs 5/2/15

2)  Puzzle time - Thanks Trincent.

3)  Modulo arithemetic   Thanks Melody, Chris and Heureka

4)  Translation Great for younger kids.     Thanks alan and Melody

5)  Trig problem This looks like a great question and answer.  Thanks Chris

6) Surface Area     Thanks Happy7

7)  Half life, Natural decay.    Melody

8)  Difficult School Trigonometry     Melody

9)  This Parabola attracted interest.  Thanks CPhill, Alan and Melody.

10)  Reasonably basic probability.   Thanks Melody and CPhill.

11)  Selections - Someone best check what I have done

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Feb 4, 2015
#235
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Fri 6/2/15

1)  What is Pie?    CPhill,  Nauseated and others

2)  A touch of physics    Thanks Heureka :)

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Feb 5, 2015
#236
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Sat 7/2/15

1) Nested expansion Proof -  Well Bertie, I accepted your challenge

2)  Algebra word problem.  These are great practice for middle high school students.  Thanks CPhill

3)  Another word problem with a quadratice function. Thanks Chris

4) Profit and loss with calculus.  Thanks Geno.

5) Chuirgeon Tud visited. Tis nice to know the fire water hath not killed him yet.

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Feb 6, 2015
#237
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Sun 8/2/15

1) How do you change your test result into a percentage. (out of 100)   Melody

2) Logarithm inequality    Melody

3) Trig with a error reminder.  Thanks Chris.

4) What is a focus in a parabola?   Melody

5) Basic equation using logs      Thanks Alan

6) Equations with absolute values.   Thanks Chris

7) Comparative mass of sun and star. Fabulous answer, thanks Heureka

8) Good simplifying algebra practice.   Thanks Alan.

9) limit question.  Thanks Alan

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Feb 7, 2015
#238
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Tues 10/2/15

2) Difficult Trig triangle question - Thanks Alan.

3) Internal angle sum of polygons - Thanks Heureka.

4) Solving for powers without using logs.   Thanks Chris

5) Limit question   Thanks Alan

6) Triangle trig  - continued from before.   Thanks Alan and Heureka

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Feb 9, 2015
#239
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Wed 11/2/15

1) Geometric mean   Thanks Melody CPhill and Heureka

2) Trig integration    Thanks CPhill

3) Continuous compounding  Thanks CPhill

4) A different way to do bracket expansions.  I like it! do do lots ot others    Thanks Mathematician

6) Combined rates.  I always have to think really hard about these Thanks melody and Alan.

7) Factoring quadratics to rap.  LOL        Melody

8) Finding the difference of the roots of a quadratic equation.  Thanks Heureka and Melody

9) Simultaneous equations  Thanks Alan

10) Problem question with fractions.  Thanks Heureka

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Feb 10, 2015
#240
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Thurs 12/2/15

1)  A code to crack   Thanks TakahiroMaeda and CPhill

2)  Probability      Melody

3)  Intersection of a parabola and a line.     Melody and Heureka.

4)  A good problem question for younger students.   Thanks CPhill.

5)  Interesting Co-ordinate geometry question.   Thanks CPhill

7)  Find the wavelength of ultraviolet light.   Thanks Heureka

8)  Understanding perfect cubes.     Melody

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Feb 11, 2015
#241
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Fri 13/2/15

1)  Laugh out Loud    Thanks Rosala

2)  Momentum and rhinos for Geno.   LOL      Thanks Geno

3)  Finding the orthocentre of a circle.   Thanks Melody and CPhill

4)  Minimum distance.  Chris and Melody

5)  Ratios, trig and triangles.  Hard one.  Thanks Heureka.

6)  Entering roots on a calculator   Thanks CPhill and Melody

7)  Finding prime numbers,  Seive of Eratosthenes?  Great little clip here.

8)  Physics, Momentum.  Thanks Alan and Heureka

9)  Exact values of trig ratios.     Melody

10)  Some good integration happening here.  Thanks Alan and Heureka

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Feb 12, 2015
#242
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Sat 14/2/15

1)  Our web2.0calc can do a lot of things.  Thanks Chris for reminding me.

2)  Cool time site reference.     Melody

3)  Complicated algebraic equation.  (Chris took a short cut  )   Thanks Chris and Melody.

4)  Really complicated angle of elevation.     Thanks melody and Chris

5)  Geometric mean.     Thanks CPhill.

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Feb 13, 2015
#243
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Sun 15/2/15  and mMon 16/2/15

1)  Is this a safe forum ?    Thanks CPhill, Nauseated and Melody.

2)  Trigonometry   Thanks Geno

3)  Is X+2 is the same as     $$\frac{(X+2)(X+3)}{(X+3)}\;\; ?$$      Thanks Geno

4)  Designing a pair of die.  great answer by Geno.

5)  Probability suited to a Venn diagram    Thanks CPhill and Melody.

6) What does right and left factorial mean?   Thanks Melody, CPhill and Heureka

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Feb 14, 2015
#244
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Tues 17/2/15

1)  Designing a pair of dice - continued from yesterday.

2)  Volume of overfull icecream cone :))  Melody

3)  General flash card site and Physics question.    Thanks anon and Chris

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Feb 16, 2015
#245
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0

Wed 18/2/15

2) Concentrates.  Who are you going to believe, CPhill or me.  LOL

3) Continuous compounding    Thanks Chris and Alan

4) Passing trains.    Thanks Melody and Alan.

6) This is a really good percentage question.  (It's a good one for almost everybody) Thanks Melody and CPhill

7) Locus Question: (good question but very poorly written IMO)  Thanks Geno and CPhill.

9) Combined momentum question.   Thanks Nauseated

I thought it was interesting because it was easy enough for me to follow.

10) What is a log?      Melody

11) A good algebra one.  Needed when working on parabolas.  Thanks Geno and CPhill.

12)  Using Venn diagrams to help with probabilities.   Melody and anon

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Feb 17, 2015
#246
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Thurs 19/2/15

1)  Understanding the graphs and pictures that we present.   This thread has been in the wrap before.   It is a really good one. Heureka Alan and I all had great input.  I just wanted to draw peoples attention to what I have written on the last post.  :)

2)  I always like Probability.    Thanks Melody and Alan

3)  This geometry one looks interesting.  Thanks Alan.

5)  Algebra rearrangement and Desmos Graph.  I liked this one.  Thanks Chris.

6)  Finding the lowest common multiple and greatest common divisor of big numbers.  Thanks Alan and Heureka.

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Feb 18, 2015
#247
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Fri 20/2/15

1)  Multiples of 13.    A good one for our younger students.  Thanks Geno

2)  Finding the internal angles in regular polygons.   Thanks Chris

3)  Another question for everyone.  Probability this time.  Thanks Geno.

4)  Finding greatest common factor.  Good for everyone.   Thanks Geno (and Euclid)

5)  Area of a regular pnetagon.    Thanks Chris and Melody.

6)  Using the quadratic formula when substitution is needed.   Thanks Chris and Heureka.

7)  Difficult Equation      Thanks Chris and Alan

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Feb 19, 2015
#248
+106943
0

Sat 21/2/15

1)  Happy Birthday Alan.  Our little forum is so very lucky to have you.

Thank you so much for being part of our team.

3)  Probability  Thanks Melody, CPhill, Geno and anon.

4)  Simultaneous Equations  Thanks Chris.

5)  Complex numbers   Thanks Geno and Melody

6)  Using algebra to help solve equations.  Suitablr for younger students.  Thanks CPhill.

7)  This number pattern question looks interesting.   Thanks Geno and CPhill.

8)  I'd call this an 'understanding numbers' question.  Thanks CPhill

9)  Probability - combinations    Thanks Melody and CPhill.

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Feb 20, 2015
#249
+106943
0

Sun 22/2/15

1)  Using Venn diagrams.  Thanks CPhill

2)  Probability - A problem with permutations.  LOL      Thanks CPhill.

3)  Senior Trigonometry - (But not too hard)   Thanks Melody and CPhill

4)  Phi function.  Thanks Heureka

5)  Can a line be straight when the Earth is a sphere?  I've answered but I'd like others to answer too.

6)  Physics - basic energy question.  Thanks anon

7)  Excellent calculus question.     Melody

8)  Finding all the 5th roots of a complex number.   Melody

9)  Integration with trig.    (If I find time I really want to do this one)   Thanks Alan.

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Feb 21, 2015
#250
+106943
0

Mon 23/2/15

1)  A suggestion for casual answerers    An old one that has had attention drawn back to it.

2)  Vectors   Thanks CPhill

3)  Complex numbers (maybe)     Melody

4)  phi(6)   Yes again, LOL      Thanks Heureka

5)  Arithmetic Progression.   Thanks CPhill

6)  Nasty looking function question.   Thanks Alan

7)  Tricky Calculus   Thanks CPhill and Melody

8)  Number puzzle, Thanks anon and Chris.

9)  Physics, Electical charges.  Thanks SevenUp and Alan

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Feb 22, 2015
#251
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0

24/2/15

1)  Area Geometry   Thanks Bertie.

2)  Euler's Equation. V-E+F=2   Thanks anon.

3)  Physics, Critical angle.   Thanks Alan.

4)  Triangle inscribed in a circle - finding sides.    Thanks CPhill.

5)  Modular Arithmetic.     Thanks CPhill and Heureka

6)  Understanding numbers    CPhill and Melody

7)  Dealing with Neg indices       Heureka and Melody

8)  Rates. These are always tricky.     Thanks CPhill

9)  Rules with infinity     Thanks CPhill

10)  I don't get why mine is wrong         Thanks Alan

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Feb 23, 2015
#252
+106943
0

25/2/15

1)   Integration using substitution.  Thanks Alan.

3)   Number puzzle with simultaneous equations  Thanks Geno

4)   Physics, projectile.      Thanks Alan

5)   Physics, determine a diameter if given the resistance.   Thanks Heureka

6)  Handshakes, Arithmetic Progression.       Thanks CPhill and Melody

7)   Finding a derivative.    Needs checking   Melody

8)   Selections and expected results    Melody

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Feb 24, 2015
#253
+106943
0

26/2/15

Riddle      Thanks CPhill  and Milan6030

Tricky cigarettes - one for the kids.           Thanks Milan6030 and watto

Word Problem with ages   Thank you Milan6030

A weights problem.  Difficult puzzle style.   Thanks Heureka and Bertie.

Determine the function.    Look interesting.    Thanks Tetration.

Ratios of plane shapes, lengths and areas.      Thanks CPhill and Melody

Trigonometry - The tilt of a dump truck.         Thanks Geno

Pythagorean Identity        Thanks CPhill and Geno

Area of a regular heptagon.    Thanks CPhill.

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Feb 25, 2015
#254
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27/2/15

1)   Trial and error to find the roots.       Thanks Alan

2)   Find the last 3 digits of 7^411           Thanks CPhill

3)   A property of a prime number            Thanks CPhill

4)   Quadratic formula   (how can you remember the quadratic formula? )    Collegeguy79 and Melody

5)   Three dimensional coordinate geometry.      Thanks Alan.

6)   Physics - torque        Thanks  Alan

7)  How to work out compound interest from formula without a calculator.        Thanks Melody and Bertie.

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Feb 27, 2015
#255
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28/2/15

1)    Riddle      Thanks, CPhill, Bertie and Melody.      (Bertie please find us a new riddle - thank you lol)

2)    Just about everyone had CDD today.  I probably should not include this but I think it is really funny.

3)    3D co-ordinate geometry, Vectors.    Thanks Alan and Heureka.

4)    Physics - Momentum                        Thanks Titration

5)    Standard simultaneous equations.     Thanks Alan

6)    Number Sequences           Thanks Melody, Heureka and CPhill

7)    Toothpick grid                   Thanks Chris

8)    A problem with numbers.           Thanks CPhill and Melody.

9)    Acute angle between 2 lines       Thanks CPhill and Melody

10)    Finding the midpoint         Thanks TheJonyMyster

11)    Manipulating indices          Thanks Alan

12)   Simplifying powers            Melody

13)    simplifing indices               Melody

14)    Another indice question, I think that we have a serial indice poster today.        Melody

15)    Sometimes questions are not as hard as they look,    Thanks anon.

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Feb 27, 2015
#256
+106943
0

Sun 1/3/15

1)    One for the children.      Thanks anon.

2)    A little memory trick, miles to kms     Thanks anon

3)    Indice inequality          Thanks anon and Melody

4)    Slope of perpendicular line.    Thanks Alan and ThisGuy

5)    Physics, Potential energy       Thanks Alan

6)    Are the 3 points collinear?   (lie on the same line)      Thanks CPhill and Alan

7)    Simultaneous equations with 3 unknowns.       Thanks CPhill

8)    Geometry     Thanks CPhill

9)    Find the Break Even point.      Thanks CPhill and anon.

10)  Problems with fractions.        Thanks anon and Melody

11)  A tricky percent question.        Thanks anon and Melody

12)  Short explanation of negative indices.     Melody

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Feb 28, 2015
#257
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Mon 2/3/15

1)   Just a repetitive question with some CPhill and Nauseated banter.  Thanks anon for answering properly

2)    Quadratic word problem.     Thanks CPhill

3)    Finding the diagonal of a cube.    Some of our middle level people might like to try this one (from scratch)        Thanks CPhill

4)    Why does the calc say that the square root of -36 is 6i      Thanks CPhill and TheJonyMyster .

5)    Co-ordinate geometry 'real life' problem.     Thanks CPhill

6)    Simultaneous Equations.       Thanks CPhill.

7)    Probability         Thanks CPhill

8)    Physics - Mass and weight       Thanks Alan

9)    Simultaneous equations with 3 variables.      Thanks CPhill and Alan.

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Mar 1, 2015
#258
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Tues 3/3/15

1)    Inverse tan             Thanks Anon and Geno

2)    Permutation            Melody

3)    Permutations and combinations     Thanks Geno

4)    Why does 0!=1 ?     Thanks CPhill and Geno

5)    Finding zeros        Thanks CPhill

6)    e to the i pi           Thanks Geno and Melody

7)    Find least common multiple    Melody

8)    More permutations             Melody

9)    Rates. Lets dig a hole.       CPhill and Melody

10)    Embedded square root equation.   Melody

11)    Algebraic Fractions         Thanks Anon and CPhill

12)    Inverse function             Thanks CPhill

15)    Ratios in similar figures     Thanks CPhill and Melody

16)    Trig identity                      Thanks CPhill

17)    Standard deviation             Thanks Geno

18)    Trig equation                    Thanks CPhill and anon

19)    Algebra    Some of our middle/upper students should give it a go.  Thanks CPhill

20)    Big numbers                    Thanks Geno

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Mar 2, 2015
#259
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Wed 4/3/15

3)    Sucessive discounts        Thanks CPhill

4)    Patterns in sequences       Thanks Geno and CPhill

5)    Equation with a radical        Melody

6)    Trig - phase shift              CPhill and Melody

7)    Find diagonal of cube given volume      CPhill and Melody

8)    Surface area of a rectangular pyramid.      Melody

9)    How many combinations?             Melody

10)    Inverse function                    Thanks CPhill

11)    Domain and range                 Thanks CPhill

12)    Equating indices.                    Thanks Alan

13)    Population growth                   Melody

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Mar 3, 2015
#260
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Thurs 5/3/15

1)     Changing the subject of a formula       Middle level students should try it.       Thanks Alan.

2)     Simultaneous equations            Thanks Alan

3)     A slightly unusual quadratic         Thanks Alan

4)     Population growth and decay      Thanks Geno.

5)     Probability                                 Thanks Alan.

6)     Permutations - I have no idea how to do this one.  Not answered yet.

7)     Find SA when given V and r of a cylinder    Thanks CPhill

8)    Polar co-ordinates              Thanks Alan and Heureka, and Bertie

9)    This geometry one looks interesting         No answer yet.

10)  Finding the 4th vertex of a parallelogram.     Thanks CPhill and Heureka

11)  Normal distribution                 Melody

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Mar 4, 2015
#261
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Fri 6/3/15

1)    3D Geometry.        Melody

2)    What is the co for in cosine?        Melody

3)    Permutation, a bit tricky.              Melody

4)    Finding average speed      Thanks Alan

5)    Selections.  Everyone can try this question.  It is very cool         Melody

6)    Counting.   This is another counting one that everyone can try.  It is just a matter of being methodical.  Thanks Heureka.

7)    Negative indices     What do you do with them?            Thanks CPhill

8)    Logarithm equation               Melody

9)    Scaling.     We have has quite a few of these lately but the concept is a really good one for everyone to understand.      Thanks CPhill.

10)    Average and instantaneous velocity         Melody

11)    Ratio of angles to sides of triangle           Thanks  Chris

12)    What is a year ?                                 Thanks Heureka

13)    Finding the exponential function             Thanks Geno

14)    Ratios with simultaneous equations         Melody

15)    Simultaneous Equations by elimination.    Heureka has laid this out beautifully.   Thank you

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Mar 5, 2015
#262
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Sat 7/3/15

1)     Cheer up - It is the weekend.        Thanks Rosala

2)    Little percent question for the younger set.       Thanks Geno

3)     Repeat puzzle question.    WOW I finally get it.      Thanks Alan and Bertie.

4)    Probability for beginners                  Melody

6)    How to work out a function from a table of values 2     Thanks Geno

7)    Angle speed           Melody

8)    Conglomerate Sequence         Thanks anon.

9)    Diameter of the sun.      Thanks anon Alan and Melody

10)  Motion Physics              Thanks Alan

11)  Puzzle and probabiliy questions            Melody

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Mar 6, 2015
#263
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Sun 8/3/15

1)    Police radar problem continued.                 Thanks Alan, Nauseated and Bertie.

2)    Difficult trig simplification.                           Anon and Melody

3)    Manipulating complex numbers                  Thanks Anon and Heureka

4)    0.9 repeater as a fraction                           Melody

5)    Exponentials and graphs                             Thanks CPhill

6)    3D Geometry - looks interesting                 Thanks Alan

7)    Locus - looks interesting                             Thanks CPhill

8)    Probability                                                  Thanks CPhill

9)    How to estimate high powers using logs.     Thanks CPhill and Heureka

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Mar 7, 2015
#264
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Tues 10/3/15

1)    Who will win the race?                         Thanks anon and Heureka

2)    What is an asymptote?                        Thanks anon

3)    Simplifying Algebraic Fractions              Thanks Heureka

4)    Probabilities in Chess                            Thanks Melody and Geno

5)    Determining lowest common multiple    Thanks Geno

6)    Equations with logs and exponentials     Thanks Alan

7)    Surface area of a cone                          Thanks CPhill and Alan.

8)    Find the original price                            Thanks Melody and DakotaTheRul3R

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Mar 9, 2015
#265
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Thurs 12/3/15

1)     Manipulating inverse trig      Melody

2)     Eratosthenes -                   Thanks anon

How did this ancient mathematician estimate the circumference of the Earth?

3)     Border around an octagon.  This question was vague but I liked it.  Thanks Anon, CPhill and Melody

4)     Similar triangles                 Thanks anon

5)     Factorizing                        Thanks CPhill

6)     Area of a triangle.              This is a good question for the younger ones to try.     Thanks CPhill

7)     Probability in chess            Thanks Nauseated Melody and Geno

8)      Volume of a hollow cylinder       Thanks CPhill

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Mar 11, 2015
#266
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Friday 13/3/15

CPhill (Chris) has been with us for exactly one year today.  It has been a wonderful year for Camelot.

knight in dark glasses.

1)    Meaning of life. A new explanation.                         Thanks  SweatyPerson666

3)    This is a stupid question but it has some comic appeal.

4)    Force       Can someone check please.                      Melody

5)    Trig identity                                                              Thanks CPhill and Heureka

6)    How can you know arcsin(1/2) without a calc.          Thanks Anon and Melody

7)    Range and Domain of absolute functions                   Thanks CPhill

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Mar 12, 2015
#267
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Sat 14/3/15

1)    Riddle time                                              Thanks Rosala

2)    "Stupid question" carried over from yesterday - it turned into an interesting question after all.

Thanks Melody, anon, Nauseated and CPhill.

3)    Inverse trig       For the moment I am a bit confused by this question.

4)    Interesting fractional indice equation         Thanks CPhill and anon.

5)    Manipulating logs                                     Thanks Alan

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Mar 13, 2015
#268
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Sun 15/3/15

1)     What happened on this day in 1879?                      Thanks AlbertEinstein

2)     Interesting probability - students in a circle              Melody, Alan and CPhill

3)     Manipulating logs                                                   Thanks anon

4)     How many 3 digit numbers are multiples of 7            Thanks Alan

5)     Estimating the sqrt(6) without using the sqrt key.     Thanks CPhill and Melody.

6)     Combinations. 3 mathematicians, 3 answers, nothing like variety.   Thanks Alan, Melody and CPhill.

9)     Poker    (we all got it wrong)                                    Thanks Alan, CPhill and Melody

Here is a useful website that CPhill found for us.       http://en.wikipedia.org/wiki/Poker_probability

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Mar 14, 2015
#269
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mON 16/3/15

1)    What is the difference between a cat and a comma?     Thanks anon.

2)    Solving a difficult inequality                 Thanks  Melody and CPhill

3)    Tricky trig derivative.                          Thanks Melody and CPhill

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Mar 15, 2015
#270
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Tues 17/3/15

1)    The Monty Hall problem.                   Yes again LOL    I found a cool clip for it.

2)    Finding volume of an odd shape.       Melody

3)    What is the last digit of pi?               Thanks TayJay, anon and Heureka

4)     Manipulating algebra                        Thanks CPhill and anon

5)     Physics - Force and Power.               Thanks Alan

6)     Probability  (secret santa)                 Melody

7)     Fining an angle using sine rule           Thanks melody and CPhill.

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Mar 16, 2015
#271
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Wed 18/3/15

1)     A Serious weight problem.                                                     Thanks anon

2)     Forum humour for the day.                                                   Thanks anon (oh and Chris lol)

3)     Volume and SA, simultaneous equations.                               Thanks CPhill.

4)     Find area when given the perimeter of a regular pentagon.       Thanks Melody and CPhill

5)     Diverge or converge that is the question.                               Thanks Melody CPhill and Alan

6)     Complex numbers                                                                Thanks Heureka

7)     Something for the younger students to ponder on.                 Thanks CPhill

9)     solve sin x = cos x                                                               Thanks CPhill, Heureka and Melody

10)   Simultaneous equations                                                        Thanks CPhill

11)   Powers of complex numbers                                                  Thanks Heureka and anon

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Mar 17, 2015
#272
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Thurs 19/3/15

1)    Chris's quip for the day                                                                 Thanks CPhill

3)    Explanation of e                                                                           Melody

4)    Combinations - How big would n need to be?                                  Thanks CPhill and Melody

5)    More permutations                                                                       Thanks CPhill and Melody

6)    More permutations - I love probability - it is so contraversial.  :)        Thanks CPhill, Geno and Melody

7)    Great sequence question                                                               Thanks Geno, CPhill and Melody

8)    Simplifying horrible algebraic fractions                                             Thanks Geno

9)    More possibilities - mini sudoku                                                      Melody

10)    Simultaneous equations                                                              Thanks CPhill

11)    How tall is the tree - angles of depression and elevation                 Thanks CPhill and Melody

12)    Differential                                                                                Thanks CPhill

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Mar 18, 2015
#273
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Fri 20/3/15

1)     Using trig identities                                               Melody

3)     Factoring by hand and using the Web2calc               CPhill  and Geno

4)     Function of a function                                            CPhill

5)     Understanding equation translations                       Alan and Melody

6)     Manipulating trig                                                    Melody

8)     More contraverial combinations 1                         CPhill and Melody

It would have helped if I read the questions correctly the first time

9)     and another 2                                                       CPhill and Melody

10)   and another 3                                                       CPhill and Melody

11)   and another 4                                                       CPhill and Melody

12)   Complementary events                                           CPhill and Melody

13)   Permutations on a grid                                           CPhill and anon

15)   Integration, area and centroid                                 CPhill and Alan

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Mar 19, 2015
#274
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Sun 22/3/15

2)     Algebra with geometry  (not too high level)           CPhill

3)     Binomial Probability - Fairly straight forward.         CPhill

5)     Finding vertex and roots of a quadratic                 Melody, anon and CPhill

6)     Difficult integration                                              Melody (but it is wrong)

7)     Continuation of counting outcomes                       Nauseated

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Mar 21, 2015
#275
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mon 23/3/15

1)     Diagonals of a strictly convex polygon             Thanks CPhill

2)     Difficult integrations                                       Thanks Melody, Alan and Chris

3)     Dot products and cross products of vectors    Thanks Melody CPhill and Alan

4)     Probability density and integration                   Thanks Alan

5)     Derivation of the quadratic formula                  Thanks CPhill

6)     Finding 3rd side when given area of a triangle   Thanks CPhill and Melody

7)     Find the equation of the normal to the curve.    Thanks CPhill and Melody

9)     Probability Integrals                                        Thanks Alan

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Mar 22, 2015
#276
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Tues 24/3/15

1)    Factoring quadratics, I have preserved this as the beginning of a proper explanation.  It is just a start but I have put it in refernence material.  I often make use of the threads in there and sometimes I make time to expand upon them.  :)

2)    Quadratic equation. A little different from usual                         Thanks Alan

4)    Simultaneous equations ages                                                  Not answered

5)    Good Surface area question                                                    Not answered

6)    Continuous decay                                                                  Thanks CPhill

7)    Tricky looking variation question                                              Thanks CPhill

8)    (-1) to a power      For the children                                      Melody and anon

9)    Recursive function                                                                  Melody

10)    Scientific notation     Great answer                             Thanks Gibsonj338

11)    Absolute value equation            For the younger ones             Thanks Geno

12)    Find the determinant of a matrix                                            Thanks Heureka

13)    Matrices Cramer's Rule                                                          Thanks Heureka

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Mar 23, 2015
#277
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25/3/15

1)     Using Poisson Distribution for probability                   Thanks Alan

2)     Simultaneous equations, I have shown you what you should not do.  :)   Thanks CPhill and Bertie

3)     Volume of a balloon at different temperatures             Thanks Alan

4)     Trigonometry                                                           Thanks Alan

5)     Complex number proof                                             Thanks Reinout-g and Bertie

6)     Probability for the young ones                                   Thanks CPhill

7)     Estimating huge numbers using logs                          Thanks CPhill

8)     Probability                                                               Melody

9)     Age puzzle    (from mathsGod    )                         Thanks Bertie and CPhill

10)   Trigonometry   (practical)                                         Thanks Alan

11)   Calculus                                                                 Melody and CPhill and unanswered

12)   Interesting trig graphing question.                            Thanks CPhill

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Mar 24, 2015
#278
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Thurs 26/3/15

1)     A great counting exercise for everyone                              Thanks CPhill and Heureka

2)     Why are there no simultaneous solutions.                           (For the juniors)   Melody

3)     If you have a percentage how do you find the original ?        (For the juniors)   Thanks BrittanyJ

4)     What does -52 equal                                                        (For the juniors- FTJ)   Thanks CPhill

6)     Playing at squaring numbers                                             Thanks CPhill and Melody

8)     Trig problem                                                                   Melody

9)     Trig equation                                                                  Thanks CPhill

11)     Limit                                                                              Thanks Melody and CPhill

12)     Calculus                                                     Thanks CPhill and Melody and one not answered yet.

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Mar 25, 2015
#279
+106943
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Fri 27/3/15

* FTJ stands for "For the juniors" I want there to be something for everyone.

If you find a thread interesting please send the address (just use cut and paste) to me via private messaging and I will most likely include it in the next wrap.  I seriously want people to do this.  Please get involved.

1)    Brain Teaser Locker Problem                     Thanks MathsGod (for sharing)

2)    Polynomial Division                                  Thanks CPhill

3)    Probability (middle level)                           Melody

4)    Equation of an ellipse                               Melody

5)    Conic type                                              Thanks Alan

Tylersomers2000 has left a number of very questions on conics today so if you are interested click on his name and from his profile page click 'show posts'.

6)    Line of best Fit                                         Thanks BrittanyJ

7)    Understanding angles and division (FTJ)      Thanks CPhill

8)    Determining the last 2 digits of a power     Thanks CPhill and Melody

9)    What is the binary for p                            Melody

10)  Understanding a parabola formula              Thanks Alan and Melody

11)  Outcome counting                             Thanks Geno and Nauseated

12)  Side lengths of equilateral triangle and square of same area.  Melody & Bertie

continued from yesterday.

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Mar 26, 2015
#280
+106943
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Sat 28/3/15

FTJ means "for the juniors"

1)    Black and white tiles    (FTJ)                                                            Thanks CPhill and Geno

2)    Solution concentrations   (FTJ)                                                        Thanks CPhill

3)    If you know a percentage how do you get the original.  (FTJ)          Thanks Geno

4)    Who first used $${\mathtt{\pi}}$$                                                                           Thanks TayJay

5)    Counting points on a lattice                                                             Thanks Geno and Melody

6)    Counting paths from A to B on a lattice                                            Thanks Heureka

7)    Probability, counting red and blue cards 1                                         Thanks Geno and CPhill

8)    Probability, counting red and blue cards 2                                         Not answered

9)    More counting - chords this time                                                     Thanks CPhill and Geno

(we are getting a lot of counting questions lately,

maybe I include too many here but they always fascinate me.)

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Mar 27, 2015
#281
+106943
0

Sun 29/3/15

FTJ means "for the juniors"

1)     Probability of choosing red and blue cards                                Thanks Melody and Alan

2)     Simultaneous Equations      (middle high)                                 Thanks CPhill

3)     Entering roots on the Web2 calc        (everyone)                       Melody

4)    Subtracting mixed numerals      FTJ                                           Melody

5)    Simplifying algebraic fractions (introduction)    FTJ                       Melody

6)    Physics, force                                                                          Melody

7)    A new calculator function.  I have not seen this before.            Thanks Heureka.

8    Cross-partial derivative                                                 Thanks Melody, Heureka, Alan and Bertie.

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Mar 28, 2015
#282
+106943
0

Mon 30/3/15

FTJ means "For the Juniors"

1)     Counting arrangements of beads on a bracelet                    Melody

2)     Counting Lattice points                                                       Thanks Alan and CPhill

3)     More lattice counting       Different answers.                        Thanks CPhill and Melody

4)     Counting letter combinations  More input needed. lol           Thanks CPhill and Melody

They should hire us to make multiple choice answers for these scenarios.   lol

5)     Force required - lever used                                                 Not answered

6)     Probability - different from usual                                         Thanks Gino

7)     Counting - b***s into boxes                                                 Thanks Alan and Nauseated

8)     Counting question   Everyone could try this one. FTJ           Thanks CPhill

9)     Counting chords      Another one that everyone can try     FTJ          Thanks Alan

10)     3D coordinate geometry, circles ans spheres                    Thanks CPhill and Alan

11)     Triangle dilations                                                              Thanks CPhill

12)     Subtracting fractions - you should try it MG     FTJ             Thanks Heureka

13)     Simplifying trig identities                                                    Thanks CPhill

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Mar 29, 2015
#283
+106943
0

Tues 31/3/15

FTJ means  "For the Juniors"

1)     Trig integral                                                             Thanks CPhill

2)     What does nCr mean?                                             Thanks Geno and Melody

3)     Combination probability                                           Melody

4)     How to calculate slant height of a square pyramid    Thanks CPhill and Melody

5)     Understanding negative indices                                Melody

6)     Rectangular form and polar form of complex numbers      Thanks Alan

7)    3D graph and vectors            looks interesting :/               Not answered.

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Mar 30, 2015
#284
+106943
0

Wed 1/4/15

FTJ means "For the Juniors"

1)    If I divide by zero will my calculator explode?    Thanks CPhill

3)    Interesting Mercury facts                                 Geno3141 and Siera01

4)    Factorising trinomials                                      Melody

5)    Solving a 2 step equation   FTJ                       Thanks CPhill

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Mar 31, 2015
#285
+106943
0

Thurs 2/4/15

FTJ means "For the Juniors"

1)     A counting exercise that a logical person of any age can try.  It is not easy though.             Melody

2)     Another contentious counting exercise.  We need more input please.              Thanks CPhill and Melody

3)     Simultaneous Equation - great explanation and good for revision                    Thanks Alan

4)     Finding a limit.                                                                                               Thanks Alan

5)     Why is -5^2=-25 ?                                                                                       Thanks CPhill

6)     Finding the pattern                                                                                        Thanks CPhill

7)     Basic combination counting question                                                              Thanks CPhill

8)     Order of operation - A good one for younger ones to practice on                    Thanks CPhill

10)   What is i ?                                                                                                      Thanks Geno

11)   Probability ok for middle high school                                                             Thanks Geno

12)   A grid counting exercise - you can do it without formula - give it a go.        Thanks Melody and CPhill

13)  Where is the alien spaceship going to roll ?                                                    Thanks Bertie

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Apr 1, 2015
#286
+106943
0

3/4/15

FTJ means "For the Juniors"

1)    Using remainder theorem with polynomials                    Thanks CPhill and Melody

2)    Visualizing in 3D                                                            Thanks Geno.

3)    Simultaneous Equation - making sense of words           Thanks Alan

4)    Tricky ratio question.                                                   Thanks Geno3141

5)    This looks like a good counting one        FTJ                 Thanks Geno

6)    A tricky year 8 function question.   :/                            Geno

7)    Angular velocity - for everyone                                     Thanks CPhill

8)    Finding the factors of quadratics                                    Thanks CPhill and Melody

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Apr 2, 2015
#287
+106943
0

Sat  4/4/15

FTJ means "For the Juniors"

1)   Rosala's new funnies                                     Thanks Rosala

2)   I am getting tired and i like this question.        Melody and anon.

3)   Proof: Algebraic Fractions                              Melody

4)   Variations on a counting exercise                   Thanks Alan, Bertie, CPhill and Melody.

5)   Eggs and chickens and days                          Thanks Civonamzuk, Melody and anon.

6)   Probability/counting Cards this time               Thanks CPhill

7)   Another counting problem 1                          Thanks Alan

8)   And another probability one                           Thanks Geno

9)   Trig equation                                                 Thanks Geno

10)   Using remainder theorem                            Melody.

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Apr 3, 2015
#288
+106943
0

Sun 5/4/15

FTJ means "For the Juniors"

1)      Statistics - binomial distribution                           Thanks Geno

2)      Simultaneous equations                                      Thanks Geno and CPhill

3)     Probability of winning the jackpot                        Thanks CPhill

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Apr 4, 2015
#289
+106943
+5

Mon 6/4/15

FTJ means "For the Juniors"

1)     How many ways can k computers be connected to N periferals (cont)       Thanks Bertie et al.

2)     Alien spaceship (cont)     Alan found us a great 3D graphing program that i have added to our "reference material" sticky topic

3)     Manipulating logs                                                                                     Thanks CPhill and Melody

4)     Geometry with cosine rule                                                                       Thanks CPhill

5)     Volumes and the power of the web2 calc                                                  Thanks CPhill and Nauseated

6)     Great questions for the little kids                                                           Thanks CPhill and Melody

7)     Probability (using combinations)                                                               Thanks Alan and Melody

9)     Combinations - vertices of an octahedron                                                 Thanks CPhill

10)   Horrible big powers                                                                                   Thanks CPhill and Melody

11)   Manipulating trig                                                                                        Thanks CPhill

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Apr 5, 2015
#290
+106943
0

Tues 7/4/15

FTJ means "For the Juniors"

1)      A bit of monkey business                             Thanks CPhill and Alan

3)      Factorizing sum of 2 cubes                          Thanks CPhill and Melody

4)      Basic probablility   (suitable for middle high)  Thanks CPhill

5)      Probability and ratios                                    Thanks CPhill and Melody

6)      What is the factorial of a decimal                 Thanks Geno and Melody

7)     Trig - be careful with those neg signs.           Thanks Alan

8)     What is nCr and nPr ?                                  Melody

9)     Fibonacci sequence as a formula                  Thanks Geno

10)   Interior angle sum of a hexagon FTJ            Melody

11)   Angular and linear velocities                         Thanks CPhill

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Apr 6, 2015
#291
+106943
0

Wed 8/4/15

FTJ means "For the Juniors"

1)      Solving quadratic inequalities                              Thanks CPhill

3)      Rationalizing the denominator                            Melody

4)      Solving Trig equations                                        Thanks CPhill

5)      Function Notation    FTJ                                    Thanks CPhill

6)      A good volume question                                    Thanks Alan

7)      Functions and their graphs                                 Thanks CPhill, Alan and Melody

8)      Scientific notation and significant figures   FTJ     Thanks anon and Melody

9)      Counting again.  I must have tooo much time one my hands     LOL

10)    Trig identity proof                                              Not answered.

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Apr 7, 2015
#292
+106943
0

thurs 9/4/15

FTJ means "For the Juniors"

1)     Counting question - Repeated

2)     Fairly Basic probability - good for middle/upper high school             Melody

3)     Compounded pay rises                                                                 Thanks Civonamzuk and Reinout-g

4)     Number facts        FTJ                                                                   Thanks Anon

5)     Transforming number plane graphs - this is really cool maths      Melody

6)     Working with rates                                                                       Thanks CPhill

7)     IRA Calculus question                                                                    Not answered yet

8)     Manipulating trig - Inverse sine                                                      Thanks CPhill and Melody

9)     Finding lowest Common Denominator use prime factors.               Thanks CPhill

10)   Solving quadratics by completing the squares                                 Thanks CPhill  (and you tube )

11)   Volume       (for lower high school students)                                  Thanks Natthada

12)   What are Tree diagrams        FTJ                                                   Thanks Natthada

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Apr 8, 2015
#293
+106943
0

Fri 10/4/15

FTJ means "For the Juniors"

1)      Probability with biased dice                                                           Melody

2)      Forming and solving equations      Good for lower/middle high       Thanks  CPhill and AmandXo

3)      Is X=4 a function.                                                                        Thanks CPhill

4)      What is a caret ?                                                                          Melody

5)      Squaring negative numbers.          FTJ                                          Melody and anon

6)      Composite functions that is functions of functions                         Thanks for the site reference Alan

7)      Perimeters of 'concentric' triangles                                                Thanks Alan

Is concentic the right word ?

8)     Why does 0!=1                                                                            Thanks CPhill and Melody

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Apr 9, 2015
#294
+106943
0

Sat  11/4/15

FTJ means "For the Juniors"

3)     Basic trig differentiation.                                  Thanks Melody, CPhill and Badinage

4)     Concentric triangles - again                             Thanks Alan, Bertie and Zacismyname

5)     Lotto,  probability                                            Thanks Chris and Alan

6)     Do parbolas have asymptotes?                        Thanks CPhill

7)     Very basic differentiation                                 Thanks Melody CPhill and Badinage

8)     Physics, electrostatic force                               Thanks Alan and Melody

9)     Trig equation                                                    Thanks Geno, Alan and CPhill

10)   Probability     middle high school level              Thanks Geno

11)   Negative indices                                               Thanks Geno and Melody

13)   Puzzling number question                                Not answered yet

14)   What question would 7C3 be the answer for?   Thanks CPhill

15)   What is the biggest amount that is impossible to buy.   Thanks Alan !

16)   How do you solve equations    FTJ                                  Thanks Badinage and Melody

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Apr 10, 2015
#295
+106943
0

Sun  12/4/15

FTJ means "For the Juniors"

1)      A bit of fun.                                                          Thanks Bertie

2)      Our troll got chastised.  :))                                  Thanks radio and Alan and, of course, anon :)

3)      Interpreting a time distance graph.                     Thanks CPhill

4)      Change the subject of the formula (hard one)     Not answered.

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Apr 11, 2015
#296
+106943
0

Mon 13/4/15

FTJ means "For the Juniors"

1)      Understanding powers.  I learned something here.       Thanks Bertie and Nauseated :)

Nauseated has shown us some more cool LaTex too

2)      Manipulating trig equations                                             Thanks Alan

4)      Finding an inverse matrix                                                Geno and Melody

5)      Into to algebra in geometry          FTJ                              Melody

♫♪  ♪ ♫                                ♬ ♬ MELODY ♬ ♬                                 ♫♪  ♪ ♫

Apr 12, 2015
#298
+106943
0
Apr 13, 2015