All Answers

+130517

So...we really have this.....√81 / √7 = 9 / √7

Multiplying the numerator and denominator by √7, we obtain

[9 √7] / [7]

And that's it.....

CPhillJul 10, 2014

#14

+130517

+13

JF = KJ = 10 Sides opposite equal angles are themselves equal

Therefore, m<KJF = 120

m<KJF = 120 Therefore m< KJA = 60 (The sum of any two angles comprising a strainght angle = 180)

Therefore, triangle KAJ is 30 - 60 - 90

And AJ = 5 And KA = 5√3

Then, by the Pytagorean theorem, KF = √[ (AJ + JF)^2 + (KA)^2] = √[ (5 + 10)^2 + (5√3)^2] =

√[ (15)^2 + (5√3)^2] = √[ 15^2 + 75] = √[ 225 + 75] = √[ 300] = 10√3

So....the perimeter = AJ + JF + KF + KA = 5 + 10 + 10√3 + 5√3 =

15 + 15√3

CPhillJul 10, 2014

+26400

$$\\\left(
{
(-7)\over(x-8)
}
\right)
=
\left(
{
(a)\over(8-x)
}
\right)
}\\\\
\left(
{
(7)\over(8-x)
}
\right)
=
\left(
{
(a)\over(8-x)
}
\right)
}\\\\
\boxed{7=a}$$

heurekaJul 10, 2014

#11

+394

What? No points for my brilliant post? LOL

SevenUPJul 10, 2014

#10

+118723

I think that you are right sevenUP.

The points should be given for high achievement. They should not reflect mediocrity!

MelodyJul 10, 2014

+130517

The only thing we would need to check here is if anything made the denominator = 0.

However, a quick look tells us that this can't happen because 3x^2 is always positive (or, 0) and when I add 12 to a positive - or 0- I still have a positive number. Hence, no "x" valuies make the denominator = 0.

CPhillJul 10, 2014

#10

+11912

+11

thank you 7up for those nice advices!ive never tried copying on a phone, i'll try once but i dont think it can be done!but though thank u very much!thumbs up from me!

rosalaJul 10, 2014

+839

Do you mean m=-5/6*(3*4)? If so m = -10

Rose98Jul 10, 2014

+11912

NinjaDevo u got something wrong!!

u said mrs. anonymous!Instead u should have said Miss Anonymous !

rosalaJul 10, 2014

+118723

Is this what you mean?

$$-1\times \frac{-3}{5}\\\\
=\frac{-1}{1}\times \frac{-3}{5}\\\\
=\frac{3}{5}$$

MelodyJul 10, 2014

+11912

Your Welcome Melody!

rosalaJul 10, 2014

+394

+16

Hi Rosala

If you have a regular computer this might help.

https://www.youtube.com/watch?v=RhXg4tvIft4

On a phone it would be different. Maybe you can search for youtube vids on how to do it or ask someone who has one.

7up

SevenUPJul 10, 2014

+118723

Thank you Rosala, I shall take a bow.

MelodyJul 10, 2014

#59

+118723

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

MelodyJul 10, 2014

+11912

I dont know why copying doesnt happen with me !ive tried all the methids!

rosalaJul 10, 2014

#215

+118723

@@ End of Day Wrap : Tues-Thurs 11/7/14 Sydney, Australia Time 12:01am (Really Friday) ♬

Hi Everyone,

I am sorry it has been a couple of days since it wrote the last wrap. I am really not up to where I would like to be for this one but that does mean that there are more questions available for those people who are here. There is always a bright side!

Anyway I great answers have been provided by Jboy314, GoldenLeaf, CPhill, NinjaDevo, Alan, Heureka, Rosala, Zegroes, Snip3s, DragonSlayer554, admin, Kitty<3, Rose98, Quazars, SevenUp, Will8523. Thank you, you are all wonderful.

I would like to request that when serious questions are asked and people are trying to provide serious answers that the distracting non-related posts be put elsewhere. It can be very difficult to think a difficult problem through if the thread is full of distractions. I am not saying you can't have a related joke but please keep it to a minimum. Here is one such thread. It most certainly is not the only one.

Grizzly Bear land mines. SevenUp's post is saying exactly what I am saying. Only s/he is funnier than me.

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

Now, since it has been so long I have collected up a lot of posts that you may have missed and that may interest you.

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

That is it folks, enjoy the rest of your Thursday.

♬ ♬ MELODY ♬ ♬

MelodyJul 10, 2014

+394

+15

IDK Rosala, right click select copy. Then right click paste.

It is only hard work if you have arthritis.

Also, if you want to use someones work you should say so!

7up

SevenUPJul 10, 2014

+394

It’s not funny enough for points.

Only the CORRECT answers to questions should get points.

Maybe only REALLY funny posts or REALLY cool posts should get a point.

The points on here are already so inflated they almost aren’t worth anything!

7up

SevenUPJul 10, 2014

+839

Thank you everybody! Glad you like em Melody hahaha :)

Rose98Jul 10, 2014

+26400

how to convert 486mm to m:

heurekaJul 10, 2014

#13

+839

Thanks everybody! Melody your amazing <3

Rose98Jul 10, 2014

+118723

If Chris were here he would have some witty come back for you but he is not here so ALL

you get is "yes yes, very funny 7up!"

I suppose you want some points now?

MelodyJul 10, 2014

+11912

Let me guess!,.......................................

He copied the entire thing from a website!

See i just guessed it all right!But copying this much is also not a easy task!So indirectly , DS did hard work in answering this!

rosalaJul 10, 2014

+394

+14

WOW Dragonslayer your vocabulary just jumped to college level. How did you do that?

SevenUPJul 10, 2014

+394

His computer is probably in for repair. Maybe the lame questions he answers caused it to overheat. Computers seem to get tired of things and get burnt out.

I hope CPhill doesn’t get burnt out!

SevenUPJul 10, 2014

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