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

+118724

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.

MelodyOct 26, 2013

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0

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

-5*a= -5*-2

hopefully you can finish it.

MelodyOct 26, 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)

MelodyOct 26, 2013

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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)

MelodyOct 26, 2013

+118724

0

Nothing that I know of.

MelodyOct 26, 2013

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0

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

MelodyOct 26, 2013

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0

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?

MelodyOct 26, 2013

+118724

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.

MelodyOct 25, 2013

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0

5 ³

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

OR
5 ^ 3 =

Is that you meant?

MelodyOct 25, 2013

+118724

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!

MelodyOct 25, 2013