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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Apple and plum jam.

MelodyOct 7, 2013

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I think more information is needed scrutinizer.
I had a quick look and I couldn't find any of the constants.
Sorry Ruthe

MelodyOct 7, 2013

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Well, there are 6 identical faces so you should be able to find the area of one side. 294/6= 49cm ²
Since you know the area of the square you should be able to work out the side length.
Once you have the length of the side you can work out the volume.

If I haven't given you enough help just post another reply and I will try to help more.

MelodyOct 6, 2013

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what does N and m stand for?
Is there more to this question?

MelodyOct 6, 2013

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Atoms per pencil.jpg

I think this method is used quite often by chemistry teachers but, for some reason that I cannot explain, I have never seen another maths teacher use this technique.

I think it is great I hope you can work out what I am talking about.

MelodyOct 6, 2013

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the area of a square is x squared plus 10 x plus 25 how tall the side of this square.

I've translated your question but I still don't understand what you are asking.

MelodyOct 6, 2013

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You don't seriously expect someone to go find the questions for themselves do you?

Besides, the site is password protected.

MelodyOct 6, 2013

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You can cancel out units just the same as you can cancel down numbers (in fractions)

(90 feetcubed divide by minutes ) * 45minutes/1 = 90*45 feetcubes (the minutes cancel out)

Or you can just think logically

1 cubic ft per minute for 45 minutes = 1*45cubicfeet
2 cubic ft per minute for 45 minutes = 2*45cubicfeet
...
90 cubic ft per minute for 45 minutes = 90*45cubicfeet

MelodyOct 6, 2013

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Break what down?

MelodyOct 6, 2013

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This is a really good question
I haven't seen one quite like it before.

Let the length actually purchased be x m long.
so originally the cloth is 0.9m by x m

The cloth shrinks 10% in both directions so this means that after washing the length and width are each 90% of the original.
So after shrinking the width is 90% of 0.9 = 0.9*0.9 = 0.81m
The length is 90% of x = 0.9x

Now the shrunken area is 21.87m ²
0.81 * 0.9*x = 21.87m ²
x = 21.87/0.81/0.9
x = 30 metres

MelodyOct 6, 2013