Melody

921 Questions
34314 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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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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852

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+118665

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

+118665

+2

Can you explain better what you want to know?
root 5 is an irrational number which means that it cannot be written exactly as a fraction or a decimal.
You can get an estimate from your calculator.
I probably haven't answered your question.

MelodySep 29, 2013

+118665

+2

Ok, I agree, this is a good question.
I assume that you mean the price falls by 40% of the NEW price.

Let the bike's original price by $100
It goes up by 20% which is $20. so the new price is $120.
Now the price goes down by 40%
40% of $120 is 0.40*120 = $48
New price is $120 - $48 = $72

So the original price was $100
Now it is $72
Price has dropped by $28
This is 28/100*100% decrease i.e. 28% decrease

You could choose any original price and the answer would be the same.

MelodySep 29, 2013

+118665

+2

It is just (3 squared) plus (2 squared). what is causing you a problem?

MelodySep 29, 2013

+118665

+2

I've only done part b
I have done this as a rough copy attachment.
I am notorious for making stupid mistakes but if you can follow at all it should show you how they are done.
If you would like me to explain better feel free to ask

Ajeng's problem .jpg

MelodySep 29, 2013

+118665

+2

Divide by 60 to get 1%
then multiply by 40 to get 40%

MelodySep 29, 2013

+118665

+2

I don't think that the question makes any sense.

MelodySep 29, 2013

+118665

+2

Sorry, the question does not make sense.

MelodySep 29, 2013

+118665

+2

Scientific calculators have a pi button, you usually have to press shift or inverse first.
For simple calculators just use the approximate value of 3.14159

MelodySep 29, 2013

+118665

+2

Sorry the question does not make any sense.

MelodySep 29, 2013

+118665

+2

I won't answer your question but I will tell you that 3^(-4) = 1 / 3^(+4) = 1/ 81

MelodySep 29, 2013