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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0

http://www.mymathforum.com/viewtopic.php?f=8&t=43887

And the proofs just keep coming

This one uses a geometric progression to prove that 0.9repeater = 1

Melody1 nov. 2013

+118730

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You launch a model rocket up into the sky. Right after launch the rocket is accelerating upwards at 10m/s^2. What is the magnitude of the net force in Newtons on the rocket if the rocket has a mass of 0.1 kg?

I am going to let gravity be 9.8m/s squared.

I think force = 0.1 * (19.8) N = 1.98N

(I am not 100% sure)

Melody31 oct. 2013

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2=sec(x)

2/1 = 1/cosx

1/2 = cos x

x = 60 degrees or pi/3 radians

Melody31 oct. 2013

+118730

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find the area of a quadrant of a circle whose circumference is 22cm.

First you have to find the radius using C=2*pi*r

Then the area will just be one quarter of pi*r*r

Melody31 oct. 2013

+118730

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What is the least common multiple of 3,4,7

since they have no common factors it will just be 3*4*7

Melody31 oct. 2013

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what is 3/4-9 = -9 + 3/4 =

start at -9 on a number line and go 3/4 in a positeve direction
hint: It will be between -8 and -9

Melody31 oct. 2013

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5/8 divided by 1/12

= 5/8 * 12/1

= (5*12) / (8*1)

you can finish it

Melody31 oct. 2013

+118730

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If x=gh what is h+gx(945+231)gx=h

This is a weird question.
h+gx(945+231)gx=h
subtract h from both sides and you get
gx(945+231)gx=0

rearrange
gxgx*1176 = 0

divide both sides by 1176

ggxx = 0
either g=0 or x=0 or they both equal 0

But x=gh
so if g=0 then x=0
but if x=0 either g=0 or h=0 or g and h both =0

Melody31 oct. 2013

+118730

0

6+(-6)
=6+-6
If 2 signs(+ or -) are so close together that you can put a circle around them with nothing else in the circle then, if the signs are the same replace with a + and if the signs are differen replce with a -.

You can finish it.

Melody31 oct. 2013

+118730

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20x+7+(-8x)

20x+7+-8x

20x+7-8x

20x-8x+7

can you finish it?

Melody31 oct. 2013