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

-3

873

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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

+118730

0

There are 10.2pounds of ball bearing in a box. Each bearing weights0.006 pounds how many bearing are in the box

When you get problems like this it is best to think of a similar much easier problem
eg.
There a 10pounds of wooden planks, each plank weighs 2pounds. How many planks are there?
Do you add, minus, multiply or divide.?
If you can do this simple question then you can do the same with the harder one and you will have your answer.

Melody26 oct. 2013

+118730

0

-5a squared; a=-2 Substitute the 2 in for a

-5*a= -5*-2

hopefully you can finish it.

Melody26 oct. 2013

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factorise 2x+6

You need to work out what goes into 2x and into 6. the answer to this is 2

2x+6=2*x+2*3
now take the 2 out the front

=2(x+3)

Melody26 oct. 2013

+118730

0

log ₉(1)

1 = 9 to the power of ?

This is what the question is and you should know the answer.

A logarithm is an exponent (or power if you prefer)

Melody26 oct. 2013

+118730

0

Nothing that I know of.

Melody26 oct. 2013

+118730

0

It doesn't make sense. you can't have a ^ at the beginning of a bracket.

Melody26 oct. 2013

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1nm = 10 ^-9m

456nm = 4.56 * 10 ² * 10 ^-9m

= 4.56 * 10 ^-7 m

OR

4.56 * 10 ² nm

Did you want it in nm or m or some other unit?

Melody26 oct. 2013

+118730

0

2100[1/1.057+1/(1.057)^2...+1/(1.057)^24]

Sn = a(1-r ⁿ) / (1-r)

Total = 2100 * S ₂₄

= 2100 * { [ (1/1.057)(1-1/1.057 ²⁴) ] / (1-1/1.057)}

= 27,102.42399

That's what I got anyway.

Melody25 oct. 2013

+118730

0

5 ³

It is
5 xy 3 = ( it is an x with a little superscript y )

OR
5 ^ 3 =

Is that you meant?

Melody25 oct. 2013

+118730

0

You can't solve for x when there is no x in the equation

y=-4+3.
y=-1

If you graphed this on the x y number plane it would be a line parallel to the x axis through -1 on the y axis.
x can be anything!

Melody25 oct. 2013