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

+118725

+1

I'm sorry but the question does not make sense.

Melody29 sept. 2013

+118725

+1

What is the absolute value of 9?
What is the absolute value of -9?
There are 2 possible equations to make the problem true.
So, there are two answers.
I don't actually want to do it all for you.
Is this enough help?

Melody29 sept. 2013

+118725

0

What does BM stand for?

Melody28 sept. 2013

+118725

0

The square root of 5 is an irrational number so it cannot be written exactly as a fraction or a decimal. It can only be estimated.

Melody28 sept. 2013

+118725

0

Initially y dash = 50*sin 53.1 degrees x dash = 50*cos 53.1 degrees
y=0 x=0
ongoing
y"=-g (I'll use -10) x"=0 ignore wind resistance
y' = -10t + 50sin 53.1 x'= 50*cos53.1
y= -5t^2 +(50sin53.1)*t x= (50cos53.1) *t

When y = 25
just substitute into the appropriate equation and solve with a quadratic equation.
I got 7.31 sec and 0.68 secs but I might have made a mistake.

This is enough to get you started. hope it helps.

Melody28 sept. 2013

+118725

0

I am not going to do the whole question for you but i will try to explain.
If g(x)=3*t - 6
then g(2) would equal 3*2 - 6 = 0
g(-4) = 3*(-4) - 6 = -18
g(a) = 3*a - 6

Just replace the original thing in the bracket with the new thing in the bracket.

Melody28 sept. 2013

+118725

0

I'm sorry, I don't get what Scott is saying although it would be easier to follow if this site allowed maths type.
Any way the question can only be answered if the original log is base e. So I will assume that.

log e^x = xloge = x*1 = x

So log (base e) of e^(2x+2) = 2x+2

The problem becomes 2x+2 = 7 The answer is x = 2.5

Melody28 sept. 2013

+118725

0

This is a region, there are an infinite number of answers.
First graph 5x+7y=57 It will be a dashed line because the less than sign is used.
then test a point (0,0) would be good.
If it satisfies the equation you shade in that side of the line, if it doesn't you shade in the other side.
Hope this helps.

Melody28 sept. 2013

+118725

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There is no solution to this equation.
You are asking when does 5x-55 = 5x+9
This will be true when -55=9, in other words it will never be true.

Melody28 sept. 2013

+118725

+2

It would be -1 because this is the only possible value for x

Melody28 sept. 2013