Melody

921 Questions
34316 Answers

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Mathigon website

I just discovered a site called mathigon

https://mathigon.org/dashboard
lire plus ..

Melody 2 avr. 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. lire plus ..

Melody 16 mars 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 lire plus ..

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Melody 15 mars 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

Hors sujet

Melody 13 mars 2022

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WELCOME BACK CPHILL !

Melody 11 févr. 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. lire plus ..

Melody 1 févr. 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 lire plus ..

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Melody 9 janv. 2022

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HAPPY BIRTHDAY CHRIS!

Melody 20 déc. 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 lire plus ..

Hors sujet

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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

Hors sujet

Melody 29 oct. 2021

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Also Jedithious could you tell me your age or give me an idea of what level you are at.
I want to pitch my answers at an appropriate level.
Are you comfortable with algebra?
Melody

Melody2 déc. 2013

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Can you give me an example of where you think the 5 will work?

Melody2 déc. 2013

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I deleted all the previous stuff.

I believe it will only work when the last digit is 0.
Do you want to see some logic behind it?

Melody2 déc. 2013

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"Which integers have the following property? If the final digit is deleted, the integer is divisible by the new number?

Any integer with a 0 on the end would work.

Melody2 déc. 2013

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Identify the solution(s) of the system of equations, if any -3x-4y=2 8y=-6x-4

These are both lines
If you try to solve them simulltaneously you will get no answer.

If you rearrange them to get the gradients you will find that they both have a gradient of 3/4
This means that they are parallel. They will never bump into each other.

When you solve 2 equations simultaneously you are finding where they are both true at the same time. This is also where they will cross over when they are graphed.
These two curves (which just happen to be lines) will never meet therefore they have no simultaneous solution.

Melody2 déc. 2013

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this was another more succinct answer.

http://gyazo.com/0f99cac55518414ad8b93eb7d5c9b5c4

Melody2 déc. 2013

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How about 10:16
there are of course and infinite number of answers

Melody2 déc. 2013

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Okay, I have consulted an expert and this is my feedback.

I am going to experiment with a specific example.
g(x) = 1/x
from g(x) x cannot be 0

f(x) = 3/(x+2)
from f(x) x cannot be -2 (THIS IS NOT RELEVANT)

f(g(x))= 3/ (1/x +2)
x can't be 0
1/x can't be -2 therefore x can't be -1/2

So, x is not defined at -1/2 or 0 (but it is defined at -2)

So the restrictions are from g(x) and from f(g(x)) but not from f(x)

Melody2 déc. 2013

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5x-2(x+1)=2-(x-5)

hint - this is a different question
3-(x-5)
=3+ -1(x-5)
=3+ -1*x + -1*-5
=3 + -x ++5
=3-x+5
=3+5-x
=8-x

-(x+8) = -x-8
-(-2+5) = +2-5
etc

Melody2 déc. 2013

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sqrt 75 = sqrt (25*3) = sqrt 25 * sqrt3

and you can finish it.

Melody2 déc. 2013