Melody

921 Questions
34315 Answers

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Mathigon website

I just discovered a site called mathigon

https://mathigon.org/dashboard
read more ..

Melody Apr 2, 2022

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Reporting problems.

There are a number of people having problems at the moment.
If you lodge an error can you please give all relevant information that you can think of.
Where you are in the world - the city or the country - is often very important information. read more ..

Melody Mar 16, 2022

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How to make an empty rectangle in Latex

I just worked out how to make an empty box of various horizonal size easily in LaTex.
This is not a recommended method, but other methods that I have tried here have not worked.
This coding is really simple. Just put letters inside read more ..

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Melody Mar 15, 2022

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HAPPY ANNIVERSARY CHRIS! (CPhill)

I just realized that you became a member here exactly 8 years ago today!

It has been great to have you here all that time

off-topic

Melody Mar 13, 2022

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WELCOME BACK CPHILL !

Melody Feb 11, 2022

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Very interesting question. No high level maths required.

This question was posted a couple of days ago.
https://web2.0calc.com/questions/geometry_73561

I think it is really interesting. It looks much more difficult than it really needs to be. read more ..

Melody Feb 1, 2022

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Members have a better experience. Their questions get more attention.

Almost everyone is posting as a guest.
If you post as a member your questions will have a far greater chance of a timely and helpful response.
If you are a genuine learner and interact with us, you will become known and answerers will do read more ..

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Melody Jan 9, 2022

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HAPPY BIRTHDAY CHRIS!

Melody Dec 20, 2021

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Some guidelines for question askers.

Please note:
1) Ask only one question per post.
2) When asking a question talk about what you have tried for yourself. Then people will take you more seriously and will be more able and willing to help.
3) If you get an answer read more ..

off-topic

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Melody Nov 4, 2021

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Remeniscing - a little historical humour.

I just found this old post that some of you, who have been around for a while, might find amusing.

https://web2.0calc.com/questions/look-at-the-new-leader-board

off-topic

Melody Oct 29, 2021

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0

88=(5.5)/(1+p)^30

It should first be noted that p cannot be equal to -1

88(1+p)^30 = 5.5

(1+p)^30 = (5.5/88)

noe take both sides to the power of 1/30 and you can finish it.

MelodyNov 24, 2013

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Calculate the acceleration of a biker travelling around a circular path of 36.9 meter radius at 19.9 m/s

The acceleration is into the centre of the motion and

a = v^2 /r

a = 19.9^2 / 36.9

a = 10.7 m/s ²

I think that's right but I am pretty new to this stuf too.

http://www.youtube.com/watch?v=YRBRarbMCyE
This you tube showed a proof - I thought it was interesting but if you don't follow it or don't want to know about it, it won't matter
you just need to remember the formula.

MelodyNov 23, 2013

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102 is what percent of 637.5

102/637.5 * 100%

MelodyNov 23, 2013

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Nod's answers are right but I thought you might like a reason.

20% off - divide by 5 because 20/100=1/5 you are actually multiplying by 1/5 which is the same as dividing by 5
33% off - divide by 3 because 33/100 =1/3 approx you are actually multiplying by 1/3 which is the same as dividing by 3
25% off - divide by 4 etc
10% off - divide by 10

These give the discounts, which is what you are asked for but if you needed the new price you would have to subtract the discount off the original price.

MelodyNov 23, 2013

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What is the ratio of csc(3pi/4)

This is the 2nd quadrant so sin and therefore cosec is positive

= csc(3pi/4) = 1/sin(3pi/4) = 1 divided by +sin(pi/4) = 1 divided by (1/sqrt2) = 1*sqrt2/1 = sqrt2

MelodyNov 23, 2013

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(x-2)! = 210*(x-1)! .
what is the value of x?

(x-2)! / (x-1)! .=210

x-2 = 210

x = 212

MelodyNov 23, 2013

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how can u divide 1 by 2.54, with showing your work?

For starters, you can't divide by a decimal unless you are a calculator.
think of it as a fraction 1/2.54
and multiply by 100/100 (to make the bottom a whole number)
so it becomes

100 divided by 254
As a fraction it is easy.
100/254 = 50/127

As a decimal you need to do it by long division and it is a bit hard to show you that in this forum
I found a good you tube clip that will show you how it is done,

http://www.youtube.com/watch?v=Gn2pdkvdbGQ

MelodyNov 23, 2013

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Thanks for your appreciation
I am glad that I helped.

MelodyNov 23, 2013

+118725

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undefined (so I am told)

MelodyNov 22, 2013

+118725

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25^(2x+1)=144

log25^(2x+1)=log144

(2x+1)log25=log144

(2x+1)log(5^2)=log(12^2)

2(2x+1)log(5) = 2log(12)

(2x+1)log(5) = log(12)

2x+1 = log(12) / log(5)

And you can finish it.

MelodyNov 22, 2013