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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609

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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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871

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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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0

I don't think that you usually talk about 3Dimensional figures having perimeters.
I guess you mean the combined length of all the edges.
It's regular so they will all be the same.
How many are there?
You can finish.

MelodyNov 20, 2013

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In my Algebra class we are talking about Equations as Relations and I have this problem, 3-5x=2y and I'm not really sure how to solve it ?

You can't 'solve' it. If you have 2 unknowns (x and y) then you need 2 equations before you have any chance of solving.
You could graph it if you want to. It will be a straight line.

MelodyNov 20, 2013

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(9r-3)+6 when r equals 3

Put a times sign between the 9 and the r
replace the r with the 3 (substitute in 3)
then work it out.

MelodyNov 20, 2013

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0

I have assumed this question is in degrees.

asin(sin(120)*36)/45

The question as you have written it is unsolvable because you can only find asin of a number between -1 and 1
and sin(120)*36 is more than 1

Perhaps you mean
asin(sin(120*36))/45 ?

MelodyNov 20, 2013

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On the calc I got 10,125.77133

MelodyNov 20, 2013

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First the bottom cannot be equal to zero so you have to state what the pronumeral cannot be.
Then
multiply both sides of the equation with what is on the bottom with the pronumberal. That will get it off the bottom and onto the top of the other side.
eg
5/6 = 7/(x-2)
x-2 cannot be equal to zero so x not be equal to 2

5/6 * (x-2) = 7/(x-2) * (x-2)
5(x-2) / 6 = 7
etc

If you do you fractions upright it is much easier to see.

MelodyNov 20, 2013

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Can you be more specific about what is confusing you?
Do you know how to label the sides of the right angled triangle?

MelodyNov 20, 2013

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0

http://en.wikipedia.org/wiki/Quadratic_formula

You could have googled it for yourself it would have been quicker for you.

MelodyNov 19, 2013

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r = (1/5)(ln 3)
r = 0.220
explained

This has just been done straight on the calculator

1 / 5 * ln 3 =

The calc answer is 0.2197...
Your answer has been rounded of to 3 decimal places or 3 significant figures (both the same in this case)

What is there to explain?

MelodyNov 19, 2013

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0

how do I estimate (-0.173)(-8)

Maybe -0.2*-8 = 1.6 this will be a little big.

MelodyNov 19, 2013