Melody

921 Questions
34315 Answers

+1

1

1742

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+118725

Mathigon website

I just discovered a site called mathigon

https://mathigon.org/dashboard
read more ..

Melody Apr 2, 2022

-8

609

1

+118725

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

-2

8

1459

5

+118725

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

-3

871

3

+118725

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

-4

849

3

+118725

WELCOME BACK CPHILL !

Melody Feb 11, 2022

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717

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+118725

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

-7

889

11

+118725

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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1

996

3

+118725

HAPPY BIRTHDAY CHRIS!

Melody Dec 20, 2021

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+118725

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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1091

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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

+118725

0

0.1x^2-x=-2.1

solve for x

multiply everything by 10 to get rid of the decimals
Put it all on the LHS (=0)
Solve as a quadratic
It is an easy quadratic

Have a go and if you need more help, post again.

MelodyNov 29, 2013

+118725

0

Can you describe the question?

MelodyNov 29, 2013

+118725

0

-7y = -32 ?

Divide both sides by -7

MelodyNov 29, 2013

+118725

0

16xy 4 +4x 2 y 3 -12x 5 y 4 =

If there is no symbol between a letter and a number, or between two letters then there IS an INVISABLE TIMES SIGN

16xy 4 +4x 2 y 3 -12x 5 y 4

= 16xy*4 +4x*2*y*3 -12x*5*y*4

= 64xy + 24xy - 240xy

=(64+24-240)xy

and you can finish it

MelodyNov 29, 2013

+118725

0

What are you trying to find?
and
is it a right angled triangle?

MelodyNov 29, 2013

+118725

0

363/1. = 363 divided by 1
=363

MelodyNov 29, 2013

+118725

0

yours
x(2x)(4x+3)
x(4x^2+6x)
4x^3+6x^2

mine
x(2x)(4x+3)
x( 8x^2+6x)
8x^3+6x^2

Just a little error.

MelodyNov 28, 2013

+118725

0

Can someone please help me understand how 2.7+(-12)= -9.3

If you have money in your money box then you have a positive amount of money.
If you owe money to your mother then you have a negative amount of money - because you have got less than nothing.

say you have $2.70 in your money box
Now you want to buy something so you borrow 12 dollars and spend the 12 dollars straight away that's negative 12 dollars
so you now have $2.70 + -$12 = -$9.70

In other words if you work and earn another $9.70 and then you give all your money to your mother, you will be back to having 0.

Or you could just look at +- as a pattern
1++2 = 3
1++1 = 2
1+ 0 = 1
1+-1 = 0 (by continuing the pattern)
1+-2 = -1
etc

MelodyNov 28, 2013

+118725

0

Hi reasonforeverything
What about if a,b or c was not a whole number?

MelodyNov 28, 2013

+118725

0

That depends on how much you borrow
on the interest rate
on how big the repayments are and how often they are made
and very importantly on whether it is simple interest or compound interest.
If it is compound interest you would need to know how often it is componding as well.

Simple interest questions are usually faily easy
Compound interest questions are much harder.

If you borrow a little amount you might pay simple interest but if you borrow a big amount like for a house, it will always be compound (or reducible) interest.

MelodyNov 27, 2013