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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hint

-2(x+y) = -2x+-2y = -2x-2y

-(4y-2) = -1(4y-2) = -1*4y - -1*2 = -4y + 2

5x-(4y-2) = 5x -1(4y-2) =........= 5x - 4y + 2

hopefully I have given you enough hints to work your question out by yourself

MelodyOct 17, 2013

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Use the following set of numbers to Calculate the (∑x) ²
45, 96, 33, 16, 35, 81, 71, 12, 28

x refers to each score
∑ means sum of

so very literally this means
(45+96+33+16+35+81+71+12+28) ²

I cannot think where this would be of any use to you statistically.

MelodyOct 17, 2013

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http://cropwatch.unl.edu/web/cropwatch/archive?articleID=4772532

The first thing that I discovered was that a Briish Bushel is different from a USA bushel
I have done the working for a USA bushel

volume = pi *radius squared * height
=pi * 9 ² * 17
=4325.97 feet cubed

There are approx 0.8 bushels in a cubic foot

0.8 * 4325.97 = 3461 bushels (approx)

MelodyOct 17, 2013

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Google translation
Hahaha if you get a lot (: Thanks for the question of math my name is rosey win (: I do not understand Inglés ...... eh .... a bit more

You are very welcome Rosey.

MelodyOct 17, 2013

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You are very welcome and I am sorry but I don't speak Spanish.

Usted es muy agradable, y lo siento, pero yo no hablo español.

MelodyOct 17, 2013

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the score in the middle positin is the median.

You need a cumulative column.
The middle position is (n+1)/2 where n is the number of scores
You use the cumulative column to work out what this score is.

MelodyOct 16, 2013

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MelodyOct 16, 2013

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21 * root(72)
218 root36 *root2
now you can finish it.

MelodyOct 16, 2013

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Simplify 36x^2-24x+4
It shouldn't be simplify, it is already simple, it should be factorise.
At least, I am factorising (I think Americans spell it with a z)

=4(9x^2 - 6x + 1)

Now to factorise 9x^2 - 6x + 1
You need to look for two numbers that multiply to 9*1 = +9
and add to give -6

Since they multply to a positive number, the signs must both be the same
since they add to -6, the signs must both be negative

-3 x -3 = 9 and -3+-3=-6
so the numbers are -3 and -3
you have to replace -6x with -3x-3x

so
9x^2 - 6x + 1
=9x^2 - 3x - 3x + 1
now factorise in pairs
= 3x(3x-1) -1(3x-1) the brackets must be the same
= (3x - 1) (3x-1)

=(3x-1) ²
so
4(9x^2 - 6x + 1) = 4(3x-1) ²

I know this looks long winded but if you practice it on lots of examples it will become quite easy.

If you want me to explain some of my working better just ask me.

MelodyOct 16, 2013

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-10x-27-3x=4(-2x+5)-12

You start by expanding the brackets and simplifying each side separately.
then add 13x to both sides
then I'll let you think about it.

Try it by yourself now.
If you can't do it post another reply.

MelodyOct 16, 2013