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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How do I convert a mixed number to a fraction?

Say we use 2 and 3/4

Draw some circles to represent cakes.

Now cut them all into quarters.

lightly colour 2 and 3/4 cakes.

How many quarters have you coloured? If you did it correctly the answer is 11. So you have 11 quarters OR 11/4

so 2 and 3/4 = 11/4

Without a picture you would say (2*4 +3)/4 => (8+3)/4 => 11/4

MelodyNov 12, 2013

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21 root 21 TIMES 7 root 3
= 21*7*root (21*3)
=147 * root(7*3*3)
=147 * root9 * root7
=147 * 3 * root7
=

MelodyNov 12, 2013

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6 ROOT 11 TIMES 2 ROOT 11 =

=6 x 2 x root11 x root11
=12x root(11x11)
=12 x 11
=

MelodyNov 12, 2013

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I have no idea what this even means but i googled it and this page came up.
Maybe it will help.

http://physicsenotes.blogspot.com.au/2011/12/lattice-constant-and-density.html

MelodyNov 12, 2013

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mthmn wrote:What two numbers add to -20 and when multiplied equal -100?

Let the 2 numbers be x and y

x+y=-20

xy=-100 => y= -100/x Substitute this back into the first equation

x + -100/x = -20

multiply both sides by x

x^2 - 100 = -20x

now take it all to one side and sovle it as a quadratic equation.

MelodyNov 12, 2013

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THERE ARE 8 SWITCHES 2 ARE DEFECTIVE, IF I SELECT 2 SWITCHES AT RANDOM AND TEST THEM. WHAT IS THE PROBABLITY THE SECOND SWITCH IS DEFECTIVE GIVEN THAT THE FIRST IS DEFECTIVE

Well, there are 7 swiches left and one is faulty so probability that the next one is defective is 1/7

MelodyNov 12, 2013

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See this page.

http://m.everythingscience.co.za/grade-11/02-newtons-laws/02-newtons-laws-04.cnxmlplus

MelodyNov 12, 2013

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a-b(b+c)
a=-1 b=-2 c=1

a-b*(b+c)= -1--2*(-2+1) => -1+2*(-1) => -1+-2 => -1-2 => -3

MelodyNov 11, 2013

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2e^-x (x-u)

What do you want to do with this
do you want to expand and simplify?
do you want to get rid of the negative indice?

It does = 2(x-u) / e ^x

Is that the answer you wanted?

MelodyNov 11, 2013

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Aaron has a data allowance of 200MB a month, and facebook used 10MB of data per hour. How many minutes each day, on average can Aaron spend on face book without going over his data limit (answer to nearest minute)

Months can have 30 days or 31 days or 28 or 29 days. So, you are not going to get accuracy to 1 minute unless you specify which month (I'll use a 30 day month)

10*20=200
therefor 10MB per hour = 20 hours per month

20hours /30days = 2/3 on an hour each day = 2/3*60 minutes each day =>

MelodyNov 11, 2013