@Temporary sticky questions

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!!

Tues 140506

http://web2.0calc.com/questions/what-are-some-of-the-patterns-in-fiboncacci-numbers

http://web2.0calc.com/questions/two-perpendicular-chords-with-lengths-12-2-cm-and-8-8-cm-have-a-common-endpoint-what-is-the-area-of-the-circle#rr103960

http://web2.0calc.com/questions/parabola-algebra

Harder one

http://web2.0calc.com/questions/solve-for-x_4

Discussion post

http://web2.0calc.com/questions/why-god-created-athest-people#r103922

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

http://web2.0calc.com/questions/how-many-diagonals-can-be-drawn-in-the-pentagon-regular-pentagon-nothing-special-a-5-b-10-c-15-d-20-this-chapter-is-about-permutati

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)

 http://web2.0calc.com/questions/what-is-the-sound-of-one-hand-clapping

Sunday 11/5/14   #####

A couple of interesting questions/answers

http://web2.0calc.com/questions/which-is-greater-4-300-or-3-400

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

The laughter continues.

http://web2.0calc.com/questions/what-is-the-sound-of-one-hand-clapping#r105057

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

Monday  12/5/14

Interesting Physics question.

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

Tues 13/5/14

Fun question

http://web2.0calc.com/questions/why-did-paulie-cross-the-road#r105259

http://web2.0calc.com/questions/how-big-is-pi#r105252

Puzzle still needs answer (Heureka and I did answer but Chris has changed the rules)

http://web2.0calc.com/questions/tricky-puzzle-problem-from-cphill-can-you-work-it-out#r105233

 Questions for Alan?

http://web2.0calc.com/questions/a-13552-2-n-car-traveling-at-52-2-km-h-rounds-a-curve-of-radius-1-68-multiplied-by-102-m-what-is-the-minimum-coefficient-of-static-frictio#r105328

Wednesday14th May

Polar co-ordinates

http://web2.0calc.com/questions/what-polar-coordinates-represent-the-same-as-that-of-point-p-4-30

Parametric Equations

http://web2.0calc.com/questions/how-do-you-graph-x-3-sin-3t-y-3cos-3t#r105563

Set notation - we don't get many of these.

http://web2.0calc.com/questions/z-notation-subsets#r105595

A nice show of appreciation from zegroes and info about sending private messages.

http://web2.0calc.com/questions/thanks-to-anyone-who-helps-on-this-site

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

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

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

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 !!!!

Fri 16/5/14

Difficult one

http://web2.0calc.com/questions/find-x-if-cosx-cos-180-cosinverse-0-25-cosx-6-76#r106111

Fun ones

http://web2.0calc.com/questions/who-keeps-removing-my-answers-questions

http://web2.0calc.com/questions/what-is-the-volume-of-the-pacific#r106319

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.

Saturday 17/5/14

Inequality

http://web2.0calc.com/questions/0-4-6-5x-2-5x-25-4

Commercial Maths

http://web2.0calc.com/questions/please-help-this-question-is-driving-me-crazy

Something you need to be careful about.

http://web2.0calc.com/questions/x-z-36-what-two-numbers-make-x-4z-minimum#r106507

Puzzle question

http://web2.0calc.com/questions/fraction-problem

Fun ones:

http://web2.0calc.com/questions/which-group-of-points-lies-on-the-line-y-4x-3

http://web2.0calc.com/questions/what-if-i-was-killed-by-math

Monday 18/5/14

This one is up for discussion:

http://web2.0calc.com/questions/if-x-0-what-is-the-qotient-of-40-x

Interesting one 

http://web2.0calc.com/questions/need-help-with-maths-homework

http://web2.0calc.com/questions/calculate-a-diagonal-of-the-rectangular-havind-sides-as-40-6-40-2-35-2-and-40

http://web2.0calc.com/questions/why-does-pi-and-3-14-have-different-answers

http://web2.0calc.com/questions/solving-trigonomerty-equation#r106690

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=∞

http://web2.0calc.com/questions/help-me-please_5#r106844

Wednesday 21/5/14

The fun continued

http://web2.0calc.com/questions/help-me-please_5

http://web2.0calc.com/questions/what-is-x-in-sin-36-10-x

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

Playful one

http://web2.0calc.com/questions/where-do-babies-come-from_1

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

http://web2.0calc.com/questions/help-me-please_5

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

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

Sat 23/5/14

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

http://web2.0calc.com/questions/explain-the-answer_1

Sunday 25/5/14

This one demonstrates Rosala's great attitude.

http://web2.0calc.com/questions/sunny-is-now-32-yrs-old-and-his-don-is-7-years-old-in-how-many-yrs-will-sunny-be-twice-as-old-as-his-son

This one has Reinout-g's and Alan's head spinning!

http://web2.0calc.com/questions/how-many-solutions-are-there-to-the-equation-x1-x2-x3-x4-x5-21-where-xi-i-1-2-3-4-5-is-a-nonnegative-integer-such-that-a

This one was not difficult but it was a little unusual I thought.

http://web2.0calc.com/questions/how-can-i-write-a-rule-that-translates-y-x-2-into-y-x-7-2-4

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

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/attn-lady-guinevere

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

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.

http://web2.0calc.com/questions/write-the-three-cube-roots-of-27-in-rectangular-coordinates-give-exact-answers

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

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.

http://web2.0calc.com/questions/a-message-to-all-those-complaining-about-math#rr4

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

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)

https://www.youtube.com/watch?v=N-7tcTIrers&feature=kp

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

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

Monday 2/6/14

Great probability question - and comedy for the day!

http://web2.0calc.com/questions/how-many-people-in-a-room-does-it-take-for-there-to-be-a-50-50-chance-of-2-people-sharing-a-birthday-show-and-explane-work

This one is interesting I thought

http://web2.0calc.com/questions/draw-a-graph-with-3-nodes-and-8-edges-that-would-have-an-euler-circuit

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

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

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.

http://web2.0calc.com/questions/what-formula-do-i-use-to-find-the-volume-of-a-bead-when-you-onlyhave-the-hight-like-in-the-following-problem

VIVID

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

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.

 http://web2.0calc.com/questions/domain-and-range-of-80n-275

 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.

http://web2.0calc.com/questions/is-0-5-larger-than-0-5

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"

 http://web2.0calc.com/questions/answer-of-square-root-4-must-be-plus-minus-2

Melody....could you please highlight this one on your "Daily Wrap??"

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...!!! 

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

Mon 9/6/14

Letter to Andre Massow,

Mainly concerning the message and members section.

It really must be silly season.

http://web2.0calc.com/questions/most-questions-are-answered-and-the-end-of-day-wrap-is-written-sunday-8-6-14#r7

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

http://web2.0calc.com/questions/linear-space

Magnitude of a vector - simply Pythagoras.

http://web2.0calc.com/questions/vectors_7#r1

An easy error to make - one which should be guarded against.

http://web2.0calc.com/questions/a-log-sqrt-10-b-log-sqrt-10-1-c-log-sqrt-10-2-b-2-ac

A very nice offer from NinjaDevo

http://web2.0calc.com/questions/profile-pictures

A joke.  I though it was funny

http://web2.0calc.com/questions/why-is-this-calculator-so-biased

11/6/14

A cute pic!

http://web2.0calc.com/questions/geometry_444

How to copy and paste web addresses.

http://web2.0calc.com/questions/how-to-copy-and-paste-web-addresses

12/6/14

This is Chris's favourite for the day.  It's just a little different from the norm.

http://web2.0calc.com/questions/how-do-i-find-out-the-x-and-y-intercepts-when-a-graph-is-shown

A quest for the biggest number?

http://web2.0calc.com/questions/what-is-the-biggest-number_1

Want some Coke?

http://web2.0calc.com/questions/please-help-explain-how-to-work-review-question

some complex numbers

http://web2.0calc.com/questions/z-3-z-conjugated-0

I am too tired right now to think about reinout-g's logic but it looks interesting.

http://web2.0calc.com/questions/if-you-are-going-with-hundred-twenty-lightyears-per-hour-how-many-metres-do-you-go-per-hour-asked-by-two-children-of-eleven-years-old

An old one but a good one.

http://web2.0calc.com/questions/math-question_54

So far I am both too tired and too busy to appreciate this properly - maybe some fun for my morning!

Thank you reinout.

http://web2.0calc.com/questions/begin-of-the-day-unwrap

Looks like the challange was accepted.

http://web2.0calc.com/questions/how-long-would-it-take-to-break-a-rsa2048-key-on-one-computer-that-handles-2-4-billion-instructions-per-second#r3

Questions like this always create confusion.

http://web2.0calc.com/questions/9-0#r1

13/6/14

Note for question askers

http://web2.0calc.com/questions/important-note-for-question-askers

I haven't had a chance to look at either of these 2 questions yet
but I like probability

http://web2.0calc.com/questions/probability-challenge

and I like finding roots.

http://web2.0calc.com/questions/how-do-i-factor-4x-3-15x-2-2x-21

This one promoted a little bit of discussion

http://web2.0calc.com/questions/harhit-makes-regular-deposits-of-375-each-month-into-a-savings-plan-with-a-fixed-apr-of-4-2-compounded-monthly-what-is-the-balance-of-his

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

Sunday 15/6/14

I put both these posts up to promote discussion.

http://web2.0calc.com/questions/sticky-note-information-pages-worth-keeping-and-developing-discussion

http://web2.0calc.com/questions/forum-problems-please-comment-saturday-14-6-14

A really nice introduction from a new member - Thank you Strider

http://web2.0calc.com/questions/thanks-from-a-student-who-needs-help

Volume question from Yesterday.

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

Vectors and complex numbers.

http://web2.0calc.com/questions/find-the-cross-product-of-the-following-vector-pairs-then-use-the-cross-product-to-find-the-angle-between-them-a-a-3i-2j-5k-and-b

Ratios - lengths, SA and Volume.  I like questions like this one.

http://web2.0calc.com/questions/measurement-problem-1

Monday 16/6/14

Thank you NinjaDevo

http://web2.0calc.com/questions/new-information-worth-keeping-or-developing-rough-draft

My poor brain has finally sorted it out !

http://web2.0calc.com/questions/a-probability-question

More confusion.

http://web2.0calc.com/questions/question-from-paulina-can-you-help-me-with-this-exercises-please-d

Reinout-g's set theory 

http://web2.0calc.com/questions/begin-of-lunch-box-unwrap_1

Puzzle by Pumpkinguy - thank you

http://web2.0calc.com/questions/3-men-went-to-a-hotel-to-rent-a-room-the-cost-of-the-room-was-30-each-man-paid-10-to-the-bellboy-and-proceeded-to-there-room-after-a-li

Tuesday 17/6/14

Introductory Calculus (do you think this one might be worth adding to your list Ninja?)

http://web2.0calc.com/questions/determine-the-average-rate-of-change-of-the-function-between-the-given-values-of-the-variable_1

More infinity discussion

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

Lets have an Englidsh grammar discussion

http://web2.0calc.com/questions/which-sentence-contains-a-linking-verb-he-asked-questions-about-terms-he-did-not-understand-sarit-answered-all-of-the-questions-correctly

Continuous compounding has got me thinking!

http://web2.0calc.com/questions/you-deposit-6-000-into-an-account-that-pays-5-find-the-account-balance-after-2-years-if-the-interest-is-compounded-a-monthly-b-continu

I've got to come back to this one 

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

Absolute values and function substitutions often confuse students

http://web2.0calc.com/questions/how-is-this-done

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

http://web2.0calc.com/questions/in-how-many-ways-can-6-graduates-line-up-to-receive-their-diplomas-if-there-are-4-girls-and-2-boys-and-the-girls-will-receive-their-diplomas

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

Thursday 19/6/14

Lunch box unwrap (reinout-g)

http://web2.0calc.com/questions/begin-of-lunch-box-unwrap_3

Asymtotes - I have actually wondered; How do you find oblique asymtotes?  

http://web2.0calc.com/questions/horizontal-asymptote-of-y-x-2-6x-3-x-3#r2

3D Trig

http://web2.0calc.com/questions/3d-trig

Area of overlapping objects  

http://web2.0calc.com/questions/how-do-we-find-the-area-of-an-overlapping-object

Friday 20/6/14

Lunch box unwrap - Examples of memes.  (Thanks reinour-g)

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

Geometry question

http://web2.0calc.com/questions/what-is-the-measure-of-angle-adc

I really like the way Chris (CPhill) explained this one.

http://web2.0calc.com/questions/how-do-you-do-a-question-like-this-43-7-is-32-percent-of-what

This is a revolving question - But it always has appeal.

http://web2.0calc.com/questions/if-you-put-1-grain-of-rice-on-one-square-of-a-chess-board-and-2-on-the-next-then-4-then-16-ect-how-many-grains-of-rice-would-be-on-the-la

How do I remember my times tables?

http://web2.0calc.com/questions/is-there-a-fix-way-where-i-can-memorize-the-time-table-from-1-to-12-time-table

Commercial Mathemetics

http://web2.0calc.com/questions/five-years-ago-diane-secured-a-bank-loan-of-300-000-to-help-finance-the-purchase-of-a-loft-in-the-san-francisco-bay-area-the-term-of-the

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.

http://web2.0calc.com/questions/which-sentence-contains-a-linking-verb-he-asked-questions-about-terms-he-did-not-understand-sarit-answered-all-of-the-questions-correctly#r12

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)

 http://web2.0calc.com/questions/begin-of-lunch-box-unwrap_5  

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

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

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

I am wondering if this question should have an additional answer?

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)

http://web2.0calc.com/questions/help-me-please_7

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 ♬ ♬

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

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

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.

http://web2.0calc.com/questions/a-question-about-probability

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

Sunday 29/6/14

♬                                        ♬ ♬ MELODY ♬ ♬

Rosala want to talk to us all.  (Precurser)

http://web2.0calc.com/questions/rosala-has-been-studying-different-religions-in-school-she-has-found-it-fascinating-and-would-like-to-share-a-little-of-her-own

Puzzle time:

http://web2.0calc.com/questions/mary-is-24-years-old-she-is-twice-as-old-as-ann-when-mary-was-as-old-as-ann-is-now-how-old-is-ann

I like these trig questions.

http://web2.0calc.com/questions/sin-2arctan-12-5

I liked this question too

http://web2.0calc.com/questions/the-ratio-of-the-capacity-of-tank-a-to-that-of-tank-b-is-7-3-each-tank-is-filled-with-some-water-if-the-water-from-tank-b-is-poured-into-t

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

http://web2.0calc.com/questions/magick-of-the-quadratic

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.

http://web2.0calc.com/questions/number-series-problem-need-answer-asap

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

http://web2.0calc.com/questions/a-question-you-can-answer

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.

http://web2.0calc.com/questions/pendulum-trigonometry 

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

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

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

Mon 7/7/14

♬                                        ♬ ♬ MELODY ♬ ♬

Grizzly Bear land mines. (SevenUp)

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

I always like these questions.

http://web2.0calc.com/questions/help-please_23

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

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.

http://web2.0calc.com/questions/what-is-the-center-of-a-circle-and-the-radius-of-4x-2-4x-4y-2-16y-127-0

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. 

http://web2.0calc.com/questions/a-block-of-steel-d-8-05g-cm3-weighs-157-4kg-how-many-whole-solid-cylindrical-pegs-with-a-radius-of-0-500in-and-a-length-of-2-00-in-can

14) A really good question for the younger students

http://web2.0calc.com/questions/whats-the-linear-measure-of-an-arc-whose-central-angle-is-80-on-a-circle-having-a-radius-of-18-meters

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/can-you-please-help-anyone#r33

Number Puzzle (already added to Puzzles thread)

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)

http://web2.0calc.com/questions/a-15-g-sample-of-radioactive-iodine-decays-in-such-a-way-that-the-mass-remaining-after-nbsp-t-nbsp-days-is-given-by-nbsp

Mon 14/7/14

♬                                        ♬ ♬ MELODY ♬ ♬

I like questions like this   (Thanks CPhill )

http://web2.0calc.com/questions/how-many-different-answers-can-be-obtained-by-adding-nbsp

Non linear simultaneous equations. (Thanks Alan)  (Maybe you like this one Ninja?)

http://web2.0calc.com/questions/x-2-xy-y-2-28-y-2-x-how-do-you-get-x-and-y

A good look at a very simple topic. (Thanks Ninja)

http://web2.0calc.com/questions/multiplying-a-whole-number-by-0-25-is-the-same-as-dividing-by-4

I like this little hexagon construction video clip that Alan found    (Thanks Alan)

http://web2.0calc.com/questions/how-do-you-formally-construct-a-regular-hexagon-from-a-given-line-segment

This web page Chris found has a lot of information.  (Thanks Chris)

http://web2.0calc.com/questions/graph-of-sine-of-the-angle

Cooling questin  Thanks Alan

http://web2.0calc.com/questions/a-roasted-turkey-is-taken-from-an-oven-when-its-temperature-has-reached-185-deg-f-and-is-placed-on-a-table-in-a-room-where-the-temperature-i

Radio active decay  Thanks Alan

http://web2.0calc.com/questions/a-wooden-artifact-from-an-ancient-tomb-contains-65-of-the-carbon-14-that-is-present-in-living-trees-how-long-ago-was-the-artifact-made

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)

http://web2.0calc.com/questions/i-know-the-answer-but-do-not-know-how-to-do-the-work

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

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  

http://web2.0calc.com/questions/sorry-i-didn-t-post-any-riddles-i-had-problem-with-my-computer-so-here-s-one-for-today

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

soeome really nice answers from NinjaDevo and Rosala

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

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

http://web2.0calc.com/questions/3-sup3-radic-24-sup3-radic-375

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.

http://web2.0calc.com/questions/hi-how-are-u-doing-i-had-a-question-in-my-mind-could-you-please-solve-it-what-is-the-answer-of-this-equation-8255-33-and-how-to-calculate

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

Sat 19/7/14

♬                                        ♬ ♬ MELODY ♬ ♬

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

http://web2.0calc.com/questions/urgent-solve-in-key-steps-please-v2sin-30-v1cos-30-cos-45-cos45-17#r6

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.

 http://web2.0calc.com/questions/a-street-light-is-on-top-of-a-6m-pole

3) Thankyou Rosala  

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

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?

http://web2.0calc.com/questions/help-please_25

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

Thurs 24/7/14

♬                                        ♬ ♬ 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

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.  

http://web2.0calc.com/questions/great-answers-to-learn-from-rough-draft

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

This is an interesting little question. Thanks Alan

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

Sat 26/7/14

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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

Sun 27/7/14

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A bit of fun

http://web2.0calc.com/questions/what-comes-after-trillion

An intro to LaTex

http://web2.0calc.com/questions/word-problem_9

General interest questions for our 'rat pack'

http://web2.0calc.com/questions/is-this-correctly-done

http://web2.0calc.com/questions/hi-how-do-you-simplify-4x-6y-5-2-im-doing-a-summer-course-in-math

http://web2.0calc.com/questions/if-pi-2-x-pi-and-sinx-2-5-then-tanx

http://web2.0calc.com/questions/how-do-you-write-the-following-number-in-scientific-notation-0-125340000

http://web2.0calc.com/questions/which-of-the-following-is-not-a-surd

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

 ♬ ♬ MELODY ♬ ♬    

 ♫♪

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

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Thurs 31/7/14

http://web2.0calc.com/questions/great-answers-to-learn-from

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 ♪ ♫ 

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.

http://web2.0calc.com/questions/science-link-math-question

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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?    

http://web2.0calc.com/questions/x-times-x-please-answer

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.  

http://web2.0calc.com/questions/a-radio-wave-has-a-frequency-of-8-01-108-s-1-what-is-its-wavelength-in-meters

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Sunday 3/8/14

Rosala's back!   

http://web2.0calc.com/questions/someones-back

Look at how quiet it has been!

http://web2.0calc.com/questions/you-ve-all-deserted-is-the-ship-sinking

 A very simple basic algebra question  

http://web2.0calc.com/questions/0-00365747-1-x

Worded questions always cause problems - Thanks Aziz and Ninja   

http://web2.0calc.com/questions/over-the-last-three-years-salesperson-a-has-earned-twice-as-much-as-salesperson-b-who-in-turn-has-averaged-50-more-than-salesperson-c-th

http://web2.0calc.com/questions/sally-makes-200-per-week-before-sue-had-her-pay-tripled-sally-made-twice-as-much-as-sue-how-much-does-sue-now-make-per-week

http://web2.0calc.com/questions/sheila-has-a-total-of-32-nickels-and-dimes-worth-2-50-how-many-nickels-does-she-have

http://web2.0calc.com/questions/three-workers-sort-66-boxes-in-a-day-one-of-the-workers-is-three-times-more-productive-than-the-second-worker-and-twice-as-productive-as-th

Place value  

 http://web2.0calc.com/questions/how-many-tenths-are-there-in-89-5

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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!

http://web2.0calc.com/questions/it-is-john-venn-s-180th-birthday-today-check-out-the-google-tribute

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)

 http://web2.0calc.com/questions/year-10-trig

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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

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

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

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

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

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

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.

 http://web2.0calc.com/questions/find-the-family-of-quadratic-functions-in-simplest-form-with-roots-at-2-plus-minus-3-root-5

(5) * Simplifying a difference of 2 squares.

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

(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)

http://web2.0calc.com/questions/please-show-solution-and-working-out-for-dp-dt-2p-p-0-20-and-please-list-steps-to-always-take-with-differential-equations-in-order-i-g

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

 http://web2.0calc.com/questions/435-is-15-of-what-number

(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?

http://web2.0calc.com/questions/how-do-i-know-when-to-use-tan-instead-of-sin-or-cos-when-i-think-i-ve-got-it-right-by-using-sin-or-cos-i-ve-really-got-it-wrong-because-i

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Sun 10-8-14

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

http://web2.0calc.com/questions/please-help_40

* 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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Mon 11/8/14

Interesting little 3D/algebra question.

http://web2.0calc.com/questions/in-a-rectangular-piece-of-cardboard-with-a-perimeter-20-ft-three-parallel-and-equally-spaced-creases-are-made-the-cardboard-is-then-folded

*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

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

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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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

* Solving quadratic formula

http://web2.0calc.com/questions/help-me-with-solving-this-equation-please

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

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

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

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

 http://web2.0calc.com/questions/how-to-turn-into-vector-units

* Finding an angle using trigonometry.

 http://web2.0calc.com/questions/i-need-help-finding-the-angle-of-a-right-sided-triangle#rr2

* Unusual Trigonometry Equation (easy)

 http://web2.0calc.com/questions/sin-3-cos-26-solve-for

*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.  

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Fri 22/8/14

* 1) Bearings with Vectors (Trigonometry or vectors)

http://web2.0calc.com/questions/an-aeroplan-heads-in-a-direction-of-s30-w-at-a-speed-of-300km-h-the-wind-b**w-at-a-speed-of-50km-h-in-the-direction-of-s20-e-what-is-the

* 2) Something interesting for the youngsters (Arithmetic)

http://web2.0calc.com/questions/what-is-all-the-numbers-from-1-to-100-added-up

* 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 ♪ ♫ 

Sat 23-8-14

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

 http://web2.0calc.com/questions/if-a-negative-number-is-in-parenthesis-and-has-a-positive-exponent-how-does-it-get-a-positive-number-outcome-while-a-negative-number-withou

* 2) Box and Whisters plot (Statistics)

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

* 3) Introduction to algebra

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

* 4) Introductory set theory

 http://web2.0calc.com/questions/represent-the-following-number-as-being-members-of-set-k-2-4-2-0-6-0-10-8

* 5) Some advanced calculus (Thanks Alan)

 http://web2.0calc.com/questions/help-please_27

* 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.

 http://web2.0calc.com/questions/help-please_28

* 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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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

http://web2.0calc.com/questions/how-do-turn-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?

 http://web2.0calc.com/questions/0-is-a-nbsp-odd-number-or-even-number-why-please-explain

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

http://web2.0calc.com/questions/the-answer-to-the-expression-3-6-located-on-a-horizontal-number-line

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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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

 http://web2.0calc.com/questions/how-old-they-are

* 5) Solving an equation (Great answer by NinjaDevo)

 http://web2.0calc.com/questions/4-5x-1-6x

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

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

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.

 http://web2.0calc.com/questions/can-i-calculate-a-negative-number-to-the-power-of-a-fraction-ie-1-42-1-7

* 3) Vectors.  (thanks Chris)   

 http://web2.0calc.com/questions/the-acute-angle-in-degrees-that-makes-a-with-c-when-a-4i-0j-k-c-i-j-3k

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 ♪ ♫ 

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

http://web2.0calc.com/questions/quadratic-functions-derived-from-vertex-and-a-point

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

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.

https://www.khanacademy.org/math/differential-calculus

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

 http://web2.0calc.com/questions/quadratic-functions-derived-from-vertex-and-a-point

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

7) Unanswered puzzle  

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 

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

 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)

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

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

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

http://web2.0calc.com/questions/check-my-answers

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 ♪ ♫ 

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.  

 http://web2.0calc.com/questions/please-help-what-is-the-simpliefied-form-of-radic-96-answer-needs-to-be-in-radical-form

5) Good little puzzle question

 http://web2.0calc.com/questions/i-am-a-3-digit-number-less-than-300-i-am-divisible-by-2-and-5-but-not-by-3-sum-of-my-digit-is-11-what-number-am-i

*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

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

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 ♪ ♫ 

Wed 3/9/14

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

 http://web2.0calc.com/questions/6-2-3-x-2-2-5-x-3-3-8

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.

 http://web2.0calc.com/questions/cos-sin-1-5-x

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 ♪ ♫ 

Thurs 4/9/14

1) A bit of fun from Chris

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

*2) solving inequalities with absolute values.

 http://web2.0calc.com/questions/how-do-i-solve-an-equation-like-this-x-2-with-a-line-underneath-the-8

*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 ♪ ♫ 

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)

http://web2.0calc.com/questions/if-a-mole-of-marbles-cover-beijing-how-deep-will-the-marbles-be

 *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 ♪ ♫ 

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

 http://web2.0calc.com/questions/a-recruitment-team-is-required-to-recruit-9-out-of-15-applicant-from-3-disciplines-each-containing-5-applicants-and-not-required-to-recruit

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

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.   

http://web2.0calc.com/questions/lantern-thread-most-questions-are-answered-and-the-end-of-day-wrap-is-written-sun-7-9-14

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 ♪ ♫ 

Tuesday 9-9-14

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

http://web2.0calc.com/questions/how-can-i-use-this-calculator-to-find-a-quadratic-equation-through-given-points

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

 http://www.youtube.com/watch?v=O8ezDEk3qCg

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

 http://web2.0calc.com/questions/help-maths-question-i-don-t-get-it

*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.  

 http://web2.0calc.com/questions/if-5-ducks-ate-chicken-and-2-died-from-it-how-many-would-be-left

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)

http://web2.0calc.com/questions/assume-that-c-doesn-t-equal-d-and-a-and-b-are-not-both-zero-show-that-ax-by-c-and-ax-by-d-are-parallel-lines-explain-why-the-restri 

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

Wed 10/9/14      ♬  

*1) limits (Thanks Alan)

 http://www.mathsisfun.com/numbers/scientific-notation.html

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

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)

 http://web2.0calc.com/questions/please-i-need-help-find-the-4th-number-in-the-sequence-1-7-0-1-7

 *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 ♬ ♬                           ♫♪  ♪ ♫ 

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.  

 http://web2.0calc.com/questions/a-flat-plane-on-a-3d-cartesian-grid-is-described-by-the-equation-z-2-73x-1-51y-1-99

3)Laught's from Rosala and FreemanRufus

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

 http://web2.0calc.com/questions/funny-gifs-of-the-day_2

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

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

3) Radioactive decay   (Thanks Alan)

http://web2.0calc.com/questions/radioactive-decay-question-w-t-w-0-0-000122t-where-w-t-is-the-number-of-carbon-atoms-left-after-t-years-assume-w-0-6x10-10-a

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)

 http://web2.0calc.com/questions/solve-x-y-z-1-2xy-z-2-1-for-real-x-y-z#rr1

7) Differentiating inverse trig

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

8) the effect of compounding never fails to amaze!

 http://web2.0calc.com/questions/you-are-promised-1-million-in-20-years-if-the-inflation-rate-averages-6-percent-annually-over-the-next-20-years-what-is-the-real-value-of

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Monday 15/9/14

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

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

http://web2.0calc.com/questions/the-question-in-my-trig-homework-reads-2t-5-3-i-get-the-answer-1-t-1-but-my-answer-key-to-check-my-answers-says-this-is-the-wrong-answ

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

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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

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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

 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

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

http://web2.0calc.com/questions/who-made-up-math-and-school

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

Fri 19/9/14

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

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

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

 http://web2.0calc.com/questions/how-should-i-solve-6-7-x-10-11-x-6-x-10-24-6-4-x-10-6-2-step-by-step#r2

6) Probability -  Birthday Paradox  (Melody)

http://web2.0calc.com/questions/i-didn-t-understand-birthday-paradox-completely-is-it-that-in-every-23-person-there-is-a-50-chance-to-find-a-two-persons-have-the-same

7) Interesting graph.  (Melody)

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

8) Function Notation  (Thanks Alan)

http://web2.0calc.com/questions/i-am-having-trouble-answering-this-question-what-is-the-function-notation-of-xy-1

9) Trig identity  (Thanks Heureka)

 http://web2.0calc.com/questions/solve-on-the-interval-0-2pi-4cscx-6-2

10) What is Trigonometry?  (Thanks Chloe)

 http://web2.0calc.com/questions/what-is-trigonometry_1 

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

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 ♬ ♬                           ♫♪  ♪ ♫ 

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 ♬ ♬                           ♫♪  ♪ ♫ 

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)

 http://web2.0calc.com/questions/what-is-the-natural-logarithm-of-1

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 ♬ ♬                           ♫♪  ♪ ♫ 

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 ♬ ♬                           ♫♪  ♪ ♫ 

Fri 26/9/14

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

http://web2.0calc.com/questions/a-3000-pound-car-traveling-uphill-has-a-grade-resistance-of-150-pounds-find-the-angle-of-the-grade-to-the-nearest-tenth-of-a-degree

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

 http://web2.0calc.com/questions/help-asap_2

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)

 http://web2.0calc.com/questions/1-2-0-5-5-08-18-x-2-x-3-0-5-0-295-18-1-2-x-2-1-2-x-3

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) 

http://web2.0calc.com/questions/if-there-were-280-students-voting-how-many-more-of-them-named-brownies-as-their-favorite-dessert-than-cookies

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.  

 http://web2.0calc.com/questions/if-terry-took-1-day-of-rest-every-9-5-days-out-of-142-how-many-days-did-he-actually-run

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

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 ♬ ♬                           ♫♪  ♪ ♫ 

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.

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

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 ♬ ♬                           ♫♪  ♪ ♫ 

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.

 http://web2.0calc.com/questions/help-i-need-to-know-the-size-of-each-tile

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 ♬ ♬                           ♫♪  ♪ ♫ 

Tues 29/9/14

1) Finding last digit

 http://web2.0calc.com/questions/a-1-4-at-power-34-7-at-power-35-what-s-the-last-digit-of-a

2) What graphing calculators do we use?

 http://web2.0calc.com/questions/about-graphing

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 ♬ ♬                           ♫♪  ♪ ♫ 

1/10/14

1) MacLaurin Series Expansion  (Thanks Alan)

 http://web2.0calc.com/questions/maclaurin-series

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

 http://web2.0calc.com/questions/how-do-we-solve-81x-4-16y-4-3-4#r0

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.  

http://web2.0calc.com/questions/help-please_35

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 ♬ ♬                           ♫♪  ♪ ♫ 

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.   

 http://web2.0calc.com/questions/do-i-need-to-use-simultaneous-equations-for-this-problem-below-and-if-so-how-do-i-derive-them-if-not-how-do-i-find-out-the-unknown-favi

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 ♬ ♬                           ♫♪  ♪ ♫ 

This is a very strong recommendation to ALL members of the forum.

Do not give personal information to anyone on the forum.

Do not give your full name

Do not give your address

Do not give your school

Do not give your phone number.

Do not give your personal email.

If someone sends you a message that you think may be inappropriate.  DO NOT REPLY!

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

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)

 http://web2.0calc.com/questions/math-help_38

5) I really like your answer Gino.  

 http://web2.0calc.com/questions/nothing_4

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.

 http://web2.0calc.com/questions/what-are-fractals

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

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 ♬ ♬                           ♫♪  ♪ ♫ 

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)

http://web2.0calc.com/questions/hi-i-m-tori-i-have-a-question-with-a-picture-can-you-help-me-with-this-please

2) What is a rational number?  -  Thanks Gino3141

 http://web2.0calc.com/questions/follow-up-question

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)

http://web2.0calc.com/questions/can-i-find-a-calculator-that-uses-remainders-please

5) Divisability of numbers  Thanks Chris.

http://web2.0calc.com/questions/please-help_51

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

 http://web2.0calc.com/questions/tan-x-2-cos2x

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 ♬ ♬                           ♫♪  ♪ ♫ 

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

5) Unanswered puzzle.  Can someone solve this one?    Thanks Radio.

 http://web2.0calc.com/questions/random-puzzle-v2

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 ♬ ♬                           ♫♪  ♪ ♫ 

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.   

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

7) This Physics one looks interesting but I haven't had time to really think about it yet.    Thanks Alan  

 http://web2.0calc.com/questions/motion-in-2-dimension

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

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  

http://web2.0calc.com/questions/a-hollow-cube-was-built-using-linking-cubes

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

Mon 13/10/14

1) Light fun with numbers.

 http://web2.0calc.com/questions/i-have-a-question-what-is-the-best-number

2) Why is 3.6 divided by 0.09 = 40?   (Thanks Gino and Melody)

 http://web2.0calc.com/questions/why-is-3-6-0-09-40

3) I did find this one amusing.

 http://web2.0calc.com/questions/an-echidna-can-travel-great-distances-in-its-lifetime-if-one-traveled-5-455-kilometers-in-16-years-how-many-kilometers-did-it-travel-per-y

4) Why does a negative times a negative = a positive     Thanks Melody and Chris.  

 http://web2.0calc.com/questions/why-is-a-negative-times-a-negative-a-positive-number

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

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 ♬ ♬                           ♫♪  ♪ ♫

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.

 http://web2.0calc.com/questions/if-tan-a-b-1-4-tan-a-b-1-3-then-tan2a

5) Vectors    Thanks Alan

 http://web2.0calc.com/questions/motion-in-2-dimension

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)

 http://web2.0calc.com/questions/a-quarter-is-to-be-tossed-into-a-glass-at-the-exhibition-the-glass-is-2-30-m-from-the-person-s-hand-if-the-hand-is-at-the-same-level-as-th

8) miles per hour to radians per second   Thanks Chris

 http://web2.0calc.com/questions/a-wheel-f-diameter-32-cm-spins-at-140-m-p-h-what-is-the-angular-velocity-in-radians-per-second

9) I wish I had more time to think about the ones Alan answers   Thanks Alan.      

 http://web2.0calc.com/questions/if-the-density-of-copper-is-8-92-x-10-3-g-l-and-the-density-of-magnesium-is-1-74-x-10-3-g-l-what-mass-of-magnesium-occupies-the-same-volume

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

Thursday  15/10/14

1) Let's start with some really cool photography.

 http://web2.0calc.com/questions/really-fun-slow-motion-gifs

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

4) This one made for an impressive answer by Heureka 

http://web2.0calc.com/questions/an-n-1-2n-3-find-the-n-in-this-que#r0

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

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.    

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

4) There is always room for a puzzle         

 http://web2.0calc.com/questions/nbsp-nbsp-2-sup3-nbsp-sigma-nbsp-pi-nbsp-and-it-was-delicious

5) Some monkey business is a foot.  Thanks LancelotLink.      Thanks for the serious answer too Gino

(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 ♬ ♬                           ♫♪  ♪ ♫

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.  

 http://web2.0calc.com/questions/a-spherical-water-tank-is-of-7-7m-radius-how-many-liters-of-water-can-it-contain

3) Ratios in 3 dimensionsl figures   Thanks Melody and Heureka.

http://web2.0calc.com/questions/the-radius-of-sphere-a-is-twice-that-of-sphere-b-find-i-the-ratio-among-their-surface-areas-ii-the-ratio-among-their-volumes

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.    

 http://web2.0calc.com/questions/hi-i-am-new-can-someone-help-me-with-this-trigonometry-problem

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.  

 http://web2.0calc.com/questions/why-do-you-say-math-instead-of-maths#r0

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

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

http://web2.0calc.com/questions/when-you-multiply-a-fraction-why-do-you-not-divide-instead-when-there-s-a-division-sign-in-front

4) Limits - This one took some effort

http://web2.0calc.com/questions/hope-i-can-do-this

5) Complex numbers and trig    Thanks Alan   

http://web2.0calc.com/questions/help-me-to-answer-4-cos-2-45-sin-2-45-1-2-2-4u-u-3-3u-u-this-question

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

Mon 20/10/14

1) These inequalities look interesting.    Thanks Chris and Alan.

 http://web2.0calc.com/questions/can-anyone-help-me

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 ♬ ♬                           ♫♪  ♪ ♫

Tues 21-10-14

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

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  :)

 http://web2.0calc.com/questions/can-you-calculate-this-the-points-2-4-0-0-4-a-and-b-18-is-on-a-straight-line-what-is-the-number-a-and-b

5) I was about to white this one out before I saw all the respones.  Then I decided to display it instead. :)

 http://web2.0calc.com/questions/who-ever-made-this-site-is-a-freaking-stupid-idiot-who-lives-in-a-hole-this-crapculator-dosent-even-function-right#rr0

6) Probability notation  Thanks Geno3141

 http://web2.0calc.com/questions/if-p-a-0-72-what-is-p-a

7) Bririshrain thought some people could make use of these printable times table charts.

 http://web2.0calc.com/questions/this-is-a-link-to-printable-mutiplication-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 ♬ ♬                           ♫♪  ♪ ♫

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/help-with-function-question-please

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

http://web2.0calc.com/questions/conversion-factors 

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

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

http://web2.0calc.com/questions/math_40849 

4) Here is a tough factorization.   

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

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

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.

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

3) A spot of physics anyone?   Thanks Alan and Gino

http://web2.0calc.com/questions/physics-velocity#r2

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

Sun 26/10/14

1) Vectors.   Thanks Alan

 http://web2.0calc.com/questions/2-questions_1

2) Addition  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.

http://web2.0calc.com/questions/1cis60-1991-1cis-60-1991-1-1-i-need-to-prove-this-but-the-calculator-wont-give-me-the-exact-answers

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

Mon 27/10/14

1) This one looks really interesting.  Thanks Chris and anonymous.

 http://web2.0calc.com/questions/let-b-20-14-and-c-18-0-be-two-points-in-the-plane-for-every-line-l-passing-through-b-we#r3

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/help-with-circuits

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.  

 http://web2.0calc.com/questions/what-is-the-antiderivitive-of-x-0-03-0-01sin-54x

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 ♬ ♬                              ♫♪  ♪ ♫

Tues 28/10/14

1) Some bright (school) seniors might like to think about this one.

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

 http://web2.0calc.com/questions/we-use-1-2-3-9-whats-this-problem-anser-1-x-x-x-x-x-x-x-x-1

4) An interesting limit analysis from Alan.  

 http://web2.0calc.com/questions/problem-with-limity

5) a little history lesson - Thanks Geno

http://web2.0calc.com/questions/who-made-pi

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

 http://web2.0calc.com/questions/a-concert-promoter-is-planning-the-ticket-price-for-an-upcoming-concert-for-a-certain-band-at-the-last-concert-she-charged-70-per-ticket

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 ♬ ♬                              ♫♪  ♪ ♫

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

 http://web2.0calc.com/questions/sin-cosx-0-find-x

3) I like these ones too.  function of a function.  Thanks Chris and Geno

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

4) How DID archimedes find pi (This is a great question)  ?  Thanks Alan and CPhill.  

 http://web2.0calc.com/questions/how-did-archimedes-actually-find-the-infinite-numbers-of-pie

5) Surface area of a cone    Thanks Chris and Geno

http://web2.0calc.com/questions/a-glass-cone-has-a-radius-of-7cm-and-a-vertical-height-of-24cm-the-surface-area-of-the-glass-in-cm-squared-in-terms-of-pi-is-what#r4

 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 ♬ ♬                              ♫♪  ♪ ♫

Thurs 30/10/14

1) This is a good question and answer  Thanks CPhill

 http://web2.0calc.com/questions/is-the-domain-of-f-x-x-4-x-4-x-4-equal-to-the-domain-of-g-x-x-4-justify-your-answer

2) This is a good one for junior High children   Melody.

http://web2.0calc.com/questions/recall-that-1-ml-1-cm3-suppose-that-the-volume-of-water-in-a-gradated-cylinder-is-107-5-ml-a-specimen-of-quartz-tied-to-a-piece-of-stri

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 ♬ ♬                              ♫♪  ♪ ♫

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!

 http://web2.0calc.com/questions/let-nbsp-nbsp-be-a-function-such-that-nbsp-nbsp-for-any-two-real-numbers-nbsp-nbsp-and-nbsp-if-nbsp-then-what-is-nbsp_1

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 

http://web2.0calc.com/questions/letfind-the-range-of-nbsp-give-your-answer-as-an-interval-nbsp_1

 11) This function question is not difficult - just unusual

http://web2.0calc.com/questions/please-help-and-do-it-correctly

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

Sun 9/11/14

1) Chiurgeon Tud has graaced us with his presence.

http://web2.0calc.com/questions/inverse-functions_2

2) Sometime I shall think about this - Thanks Alan

 http://web2.0calc.com/questions/square-root-approximation-equation

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

Mon 10/11/14

1) Probability combinations Thanks SevenUp

 http://web2.0calc.com/questions/in-a-club-with-9-male-and-11-female-members-how-many-5-memeber-committees-can-be-chosen-that-have#r3

2) A touch of Physics.   Thanks SevenUp and Alan

http://web2.0calc.com/questions/physics-question_4

3) Taylor Series expansion  Thank you Alan  

 http://web2.0calc.com/questions/find-power-series-expansion-for-a-2-x-1-2-b-1-1-x-2-1-2

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

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

Tues 11/11/14

1) Mystery log question

 http://web2.0calc.com/questions/log-x-logx-e-4-what-is-x

2) This nonsense question created some good playtime  Thanks Happy7 and CPhill

http://web2.0calc.com/questions/xuxian-and-rachel-had-the-same-number-of-marbles-after-rachel-gave-away-22-marbles-rachel-had-3-times-as-many-marbles-as-xuxian-how-many#rr11

3) Dance lessons for mathematicians   LOL

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

4) A bit of fun  :)

http://web2.0calc.com/questions/cphill-when-i-need-you-you-are-not-there-to-help-me

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

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

 http://web2.0calc.com/questions/help-please_54

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  

 http://web2.0calc.com/questions/let-nbsp-nbsp-and-let-nbsp-nbsp-be-the-inverse-of-nbsp-find-nbsp-nbsp

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

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

 http://web2.0calc.com/questions/why-are-ratios-so-confusing

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       

 http://web2.0calc.com/questions/can-you-explain-how-to-solve-sin-sin-1-1-4-tan-1-5-i-have-the-answer-but-i-dont-know-how-to-get-to-it-i-need-it-in-radical-form-not-a

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

 http://web2.0calc.com/questions/considering-the-fibonacci-sequence-how-does-f-with-subscript-1-2-3-4-5-610

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

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

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  

http://web2.0calc.com/questions/number-adding-possibilities

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 ♬ ♬                              ♫♪  ♪ ♫

Sat 15/11/14

1) More Physics for me to learn.  Thanks Alan.

 http://web2.0calc.com/questions/what-is-the-magnitude-of-the-gravitational-force-between-two-7-kg-objects-that-are-separated-by-2-m

2) This is a repeat from yesterday but chris added a method that I really liked. :)

http://web2.0calc.com/questions/number-adding-possibilities

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 ♬ ♬                              ♫♪  ♪ ♫

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.  

 http://web2.0calc.com/questions/please-explain-how-y-72

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

 http://web2.0calc.com/questions/does-1-degree-4-minutes-in-gmt

6) This function one looks interesting.  Thanks Chris

 http://web2.0calc.com/questions/math-help_50 

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

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

http://web2.0calc.com/questions/help-me-please_21

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

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

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 ♬ ♬                              ♫♪  ♪ ♫

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.  

 http://web2.0calc.com/questions/need-to-find-x-5-1-e-4-787-1-55x-e-4-787-1-55x

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 ♬ ♬                              ♫♪  ♪ ♫

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    

http://web2.0calc.com/questions/why-is-a-circle-360-degrees-please-explain

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

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.  

 http://web2.0calc.com/questions/nada-used-60-centimeters-of-tape-to-wrap-54-presents-then-she-used-an-additional-100-centimeters-of-tape-to-wrap-another-90-presents-how

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

6) factorising quadratics where the leading coefficient is not 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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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. 

http://web2.0calc.com/questions/not-answered-or-not-answered-as-well-as-i-would-like-or-questions-that-could-do-with-checking

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/in-throwing-3-dice-what-is-the-probability-of-getting-a-sum-of-13

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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Sun 23/11/14

Finding percent of a number (or money)

http://www.youtube.com/watch?v=rR95Cbcjzus

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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

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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.

http://web2.0calc.com/questions/help-me-please_22

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.

http://web2.0calc.com/questions/someone-please-help-me-thanks 

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Wed 25/11/14

1) It is really nice when people voice there appreciations.  Thank you anons.  

http://web2.0calc.com/questions/why-is-melody-so-awsome-that-he-she-answers-every-single-question-in-30-minutes-gaurenteed

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

 I have added this to great answers to learn from.

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.  

http://web2.0calc.com/questions/about-the-domain  

8) The Wolf pack were unusually active today.  Was it a full moon?

http://web2.0calc.com/questions/if-you-are-part-of-the-spirit-pack-please-chat-to-either-me-or-happy7

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Thurs 27/11/14

1) Another limit to memorise      Thanks Alan

http://web2.0calc.com/questions/l-hopital-rule

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Fri 28/11/14

1) Fractional powers of negative numbers.    Thanks Alan

 http://web2.0calc.com/questions/how-come-the-calculator-says-that-3-4-3-is-not-real

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

 http://web2.0calc.com/questions/find-z

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

http://web2.0calc.com/questions/check-my-answer

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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

 http://web2.0calc.com/questions/if-i-am-given-an-equation-for-circle-how-do-i-find-its-center

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)

http://web2.0calc.com/questions/abcd-is-a-paper-card-where-ba-perpendicular-to-da-it-is-given-that-ab-bc-cd-6cm-and-ad-8cm

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

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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. 

 http://web2.0calc.com/questions/using-translation-reflection-dilations-contractions-determine-the-function-of-3-f-4x

2) Speed/time question - I always like these   Thanks Chris and Melody

 http://web2.0calc.com/questions/how-do-start-the-equation

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

http://web2.0calc.com/questions/write-a-quadratic-equation-having-the-solutions-square-root-5-and-3-square-root-5

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

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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

 http://web2.0calc.com/questions/what-are-the-first-records-of-math-being-used

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 

http://web2.0calc.com/questions/hello-i-need-help-please

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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/mrs-alderidge-operates-a-soybean-farm-outside-of-grinnell-iowa-to-keep-costs-down-she-buys-many-products-in-bulk-and-transfers-them-to-s

3) Unusual equation.  I answered graphically and Heureka answered with iterations 

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 ♬ ♬                                 ♫♪  ♪ ♫

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

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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

 http://web2.0calc.com/questions/x-3-x-2-2x-2-factor-by-grouping-so-it-ends-up-with-two-binomials

4) trig equation

http://web2.0calc.com/questions/simplify-the-following-expression-cos-acos-2-x-asec-x

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

Sat 6/12/14

1) A little riddle   Thanks Happy and anon  

 http://web2.0calc.com/questions/riddle-2

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

http://web2.0calc.com/questions/select-the-true-statement-about-iterations-of-x2-c-f-x-when-x0-1-i-and-c-i

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

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)

http://web2.0calc.com/questions/can-anyone-please-tell-me-how-i-can-manually-calculate-the-answer-to-the-following-equation-my-lesson-only-shows-me-how-to-do-it-on-a-scien

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 ♬ ♬                                 ♫♪  ♪ ♫

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.

http://web2.0calc.com/questions/unanswered-question-from-yesterday

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 

http://web2.0calc.com/questions/help-please_64

4) Some difficult trig integration.   (Alan and Melody and CPhill)

 http://web2.0calc.com/questions/integral-problem

5) Volume of a sphere - A really interesting analyis by fiflvm97 and CPhill.

(I have added this to our reference material sticky thread)

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 ♬ ♬                                 ♫♪  ♪ ♫

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 :)

 http://web2.0calc.com/questions/what-is-root#r23

3) find the quadratic equation.  A great answer from Geno   Thanks    

http://web2.0calc.com/questions/how-do-i-find-a-quadratic-equation-given-only-both-zeroes-and-the-vertex-s-y-coordinate

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

 http://web2.0calc.com/questions/how-to-find-the-coefficient-of-x-in-the-expansion-of-3x-2-x-5

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 ♬ ♬                                 ♫♪  ♪ ♫

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

 http://web2.0calc.com/questions/are-there-any-sequences-between-the-prime-numbers#r3

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-countrys-population-in-1995-was-56-million-in-2002-it-was-59-million-estimate-the-population-in-2016-using-exponential-growth-formula-roun

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

 http://web2.0calc.com/questions/7-cos330-i-sin330

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

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  

http://web2.0calc.com/questions/please-please-help-me

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 ♬ ♬                                 ♫♪  ♪ ♫

Sun 14/12/14

1) Calculus, chain rule

http://web2.0calc.com/questions/after-blast-off-a-space-shuttle-climbs-vertically-and-a-radar-tracking-dish-located-1000-yd-from-the-launch-pad-follows-the-shuttle-how

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.

 http://web2.0calc.com/questions/if-all-the-dimensions-of-a-rectangular-solid-are-increased-by-2-times-what-is-the-change-in-the-volume-of-the-shape

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