Melody

921 Questions
34315 Answers

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Mathigon website

I just discovered a site called mathigon

https://mathigon.org/dashboard
lee mas ..

Melody 2 abr 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. lee mas ..

Melody 16 mar 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 lee mas ..

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Melody 15 mar 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

Fuera tema

Melody 13 mar 2022

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WELCOME BACK CPHILL !

Melody 11 feb 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. lee mas ..

Melody 1 feb 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 lee mas ..

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Melody 9 ene 2022

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HAPPY BIRTHDAY CHRIS!

Melody 20 dic 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 lee mas ..

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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

Fuera tema

Melody 29 oct 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

Melody17 oct 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.

Melody17 oct 2013

+118687

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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)

Melody17 oct 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.

Melody17 oct 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.

Melody17 oct 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.

Melody16 oct 2013

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Melody16 oct 2013

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

Melody16 oct 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.

Melody16 oct 2013

+118687

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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.

Melody16 oct 2013