Melody

921 Questions
34316 Answers

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Mathigon website

I just discovered a site called mathigon

https://mathigon.org/dashboard
lire plus ..

Melody 2 avr. 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. lire plus ..

Melody 16 mars 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 lire plus ..

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Melody 15 mars 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

Hors sujet

Melody 13 mars 2022

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WELCOME BACK CPHILL !

Melody 11 févr. 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. lire plus ..

Melody 1 févr. 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 lire plus ..

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Melody 9 janv. 2022

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HAPPY BIRTHDAY CHRIS!

Melody 20 déc. 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 lire plus ..

Hors sujet

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Melody 4 nov. 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

Hors sujet

Melody 29 oct. 2021

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5.5cm

just draw the circles like a flat donut.

the radius of the little one is 3cm and the big one is 8cm. This means that there is 5cm between the 2 circles.

If P is equistant from the two cirles it must be 2.5cm from each.

so it will be 3+2.5 = 5.5cm from the centre.

You need to draw the picture to see what I am talking about.

Melody31 oct. 2013

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what is the antiderivaive of (2t*tan t/2) * sec^2 *t/2 dt from -pi/2 to pi/2

The blue * does not belong there
also I am wondering if this should be

what is the antiderivaive of

2t * tan( t ²/2) * sec ²(t ²/2)) from -pi/2 to pi/2 with respect to t

Melody31 oct. 2013

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http://www.tsm-resources.com/alists/trip.html

Melody31 oct. 2013

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Melody31 oct. 2013

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Ok , a misunderstanding

You wrote
10 to the negative third power = 10^(-1/3) This is not scientific notations

you meant
10 to the power of negative three = 10^(-3) This is scientific notation

What you wrote was not scientific notation BUT what you meant was scientific notation.

Melody31 oct. 2013

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I am sorry but I still don't understand.
I put in a link but there is no link in your post.
I am very confused.

Melody31 oct. 2013

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explain 1.7e+13 as an actual number

Maybe you mean 1.7e^13

e is an irrational number like pi so it cannot be written exactly in numbers but, e is approximately equal to 2.718281828 (which is approx 2.718)

So 1.7e^13 is approx = 1.7*2.718*2.718*2.718*2.718*2.718*2.718*2.718*2.718*2.718*2.718*2.718*2.718*2.718 (there are 13 e's here.)

=aprox 752,102.8

Is this what you wanted to know

Melody31 oct. 2013

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Another proof that 0.9repeater equals 1 has been posted on the other forum,
If you are interested go to
http://www.mymathforum.com/viewtopic.php?f=8&t=43887

Melody31 oct. 2013

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how do I find the radius of cone using trigonometry?
That depends on what other information you have about the cone.

Melody31 oct. 2013

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if the electric company charges you $0.13 for kilowatt-hour and you use the washing machine for 103 kilowatt-hours how much do you pay

103*0.13 dollars

Melody31 oct. 2013