Melody

921 Questions
34315 Answers

-2

1728

2

+118677

Mathigon website

I just discovered a site called mathigon

https://mathigon.org/dashboard
lire plus ..

Melody 2 avr. 2022

-10

590

1

+118677

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

-4

1400

5

+118677

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 ..

●●●●●

Melody 15 mars 2022

-5

854

3

+118677

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

-6

832

3

+118677

WELCOME BACK CPHILL !

Melody 11 févr. 2022

-6

705

2

+118677

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

-8

863

11

+118677

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 ..

●●●●●●●●●●●

Melody 9 janv. 2022

-8

1

973

3

+118677

HAPPY BIRTHDAY CHRIS!

Melody 20 déc. 2021

+2

1

5468

9

+118677

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

●●●●●●●●●

Melody 4 nov. 2021

-10

1070

1

+118677

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

+118677

+1

You are very welcome! It is nice to get feedback. Thank you.

Melody30 sept. 2013

+118677

+2

20/100 * 235000
Are you allowed to use a calculator?

Melody30 sept. 2013

+118677

+2

Beats me, what kind of calculator do you have?
In old calculators you put the number in and then press square root
In new calculators it is the other way around.

Melody30 sept. 2013

+118677

+2

Let the numbers be x-1, x and x+1
set up a simple equation and then solve it.

Melody30 sept. 2013

+118677

+2

let the number be represented by x

first one; 2x-3=7 (If 2x is bigger than 3) or 3-2x=7 (if 3 is bigger than 2x)
You can get both these answers in one statement using absolute value

The absolute value of (2x-3) = 7
It is a pity there is no maths type in this forum but you just put 2x-3 between 2 vertical lines to indicate absolute value.

How about you have a go at the others yourself. If it's too hard submit another reply and i will try to help you further.

Hint: Only one of the others needs absolute value signs.

Melody30 sept. 2013

+118677

+2

Solve for x first
that is,
take 2 off both sides
then divide both sides by 6

then work out what 1 - the answer is.

Is this enough help?

Melody30 sept. 2013

+118677

+2

That is a hairy question
The calculator treats -20 as -1*20
so -20^2 becomes -1 * 20^2 = -400
If you want to square a negative number it is better just to use brackets and that will overcome all confusion.
of course, (-20)^2 = 400

Melody30 sept. 2013

+118677

+2

It will be 9.109 * 10^ something
You count how many places the point has moved. That's the number part.
Is the number very big or is it very little?
If it is big it will be +the number
If it is little it will be -the number

Melody30 sept. 2013

+118677

+2

You can just do x^3 + y^3 using the expansion that maybe you should know (x+y)*(x^2 - x*y + y^2) and then do the substitutions
I got 20* root7
It took me just 4 lines of working

If I have helped but you would like more information let me know.

Melody30 sept. 2013

+118677

+2

Don't you have a calculator with a fraction button? Or is it that you don't know how to enter fractions?
I see my role as a helper if I just give the answer without explanation then I am not helping you to learn.

Melody30 sept. 2013