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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1) expand
2) rearrange the pairs, put the ones with squares first
3) the first 2 factorise as a difference of two squares,
4) the second two factorise so that one of the factors is the same as one of the part 3 factors
5) take out the common factor so that it is now factoised properly.
6)since the answer is 0, one of the factors must be 0
This is enough hints for now, your turn

If this is not enough information ask for more but have a go yourself first.

MelodyOct 14, 2013

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I don't think so

MelodyOct 14, 2013

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that's a tricky questions!

4/9 are apples
so 5/9 are not apples
1/7 of the the not apple fruit are oranges so

1/7 * 5/9 are oranges
5/63 are oranges

5/63 of the total fruit is 180

5/63 * T = 180

T = 180 * 63 / 5
Total number of fruit is ?? You finish it and then check your answer by seeing if each part of the question is true. I haven't checked. I might have made a mistake.

MelodyOct 14, 2013

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Do you mean

5y/6 + (y-6)/5 = y + 1/8 ?

If that is what you mean you just multiply both sides by the lowest common denominator which is 6*5*8/2 = 120

You get

100y + 24(y-6) = 120y + 15
now, expand the brackets
collect like terms on the left side
subtract 120y from both sides
etc
finish it and see if montanajace is right!

MelodyOct 14, 2013

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no, you are not supposed to, that is what I said.

Were you hoping to get a response from admin, I'm sorry I butted in if you were.

If you want an answer from admin it might be better if you start a new thread and adress it to admin in the title line. imo

MelodyOct 14, 2013

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Might depend on your calculator

say you want 6*10^12

6 exp 12 =

0r, like 'essexdal' said
6 10 ^x 12 =

or
6*10^12 but this is the worst way!

MelodyOct 14, 2013

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Lots of numbers
How about
8 and 4 twenty-secondths

Is that how you spell it?

MelodyOct 14, 2013

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I am sorry but I believe this is incorrect.

root2 / 2 is regarded as the more simple form.

MelodyOct 13, 2013

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Find the slope of (m) of AB for the following points: A (5,3), B (-2,1)
Sammy's formula is correct but he has substituted in the wrong values,
gradent(slope) = y(#2)-y(#1) / x(#2)-x(#1)

x ₁=5, y ₁=3,
x ₂=-2 y ₂=1

gradient = [y ₂ - y ₁] / [x ₂ - x ₁]
gradient = (1-3) / (-2-5) = -2 / -7 = 2/7

MelodyOct 13, 2013

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I have never owned or used a calculator that does any of those things.
The calculator on this site does have those functions but I haven't tried to use them.
If you use lots of decimal places in your working and only round at the very end you should not get many rounding discrepancies.

MelodyOct 13, 2013