Melody

921 Questions
34315 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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I assume the answer would be in degrees/time period or radians/time period or revolutions per time period.
You need to give me a full question to be more specific.

Melody1 oct. 2013

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I answered this for someone else

Melody1 oct. 2013

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Do you mean 9. 7root2, and root8?

You have to simplify root 8
root 8 = root (4*2) = root4 * root2 = 2root2

7root2+ 2root2 + 9 = 9root2 + 9 cm or 9(root2+1) cm

Melody1 oct. 2013

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I could tell you but it would be better for you to google it. I've even given you alink.
http://www.aaamath.com/pro74ax2.htm

Melody1 oct. 2013

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use inverse ratio on your calculator

Melody1 oct. 2013

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0

NO pi is an irrational number 3.14 is an approximation,

Melody1 oct. 2013

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Even functions are when f(-x)=f(x) They are symmetrical about the y axis

Odd functions are when f(-x)=-f(x) The have point symmetry about the origin. This means that if f(-x) is rotated 180 degrees about (0,0) it becomes the f(x)

lets look at your one

f(x) = (x)^4 - 20* (x)^2
f(-x) = (-x)^4 - 20* (-x)^2
f(-x) = (x)^4 - 20* (x)^2 since (-x)^2 = x^2 and (-x)^4 = x^4
f(-x) = f(x)
So it is an even function

Melody1 oct. 2013

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The area of a circle is pi*(r squared)
The volume of a cylinder is pi*(r squared)*(perpendicular height)
The volume of a cone is (1/3)* pi*(r squared)*(perpendicular height)

I did it like this because a cone is just a circular pyramid and the volume of any pyramid is 1/3 of its prism partner. (a cylinder is a circular prism)
So radius=2, height=6.5 inch
volume = 1/3 * pi * 2squared * 6.5
volume = 1/3 * pi * 4 * 6.5
volume = 27.23 inches squared. (correct to 2 decimal places)

What nationality are you?
I am Australian and I have never worked in inches before. Don't worry, the maths is the same.

Melody1 oct. 2013

+118677

+1

Thanks but I know what 5! is.
5.5! is included as one of the standard functions on this site as shown in my attachment and it works on this site's calculator, but, I have never seen it before and it does not work on my standard CASIO calculator. I was hoping that a site manager (or someone else) could explain it to me.

Melody1 oct. 2013

+118677

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Do you want it written in degrees (as a decimal answer)? That's the only thing that I can think of.

If you use a scientific calc you can just enter 17 (degrees button) 41 (degrees button) 49 (degrees button) = (inv) ( degrees button )

The answer is 17.6969444444..... degrees

Melody30 sept. 2013