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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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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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

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2 equations will solve for 2 unknows.
You have 4 unknowns
You cannot solve it.

Is there more to your question that you have not posted?

MelodyNov 19, 2013

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The reciprocal index (change the index to an improper fraction first.)

MelodyNov 19, 2013

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When do u switch places on a number when ur calculating with roots. for example. √(1-√2)². and then it becomes √2-1. WHYYYY???

When a sqrt is written into a question, only the positive root is required. 1-sqrt2 is negative so that is not the correct root. The correct one would be -(1-sqrt2) = -1+sqrt2 = sqrt2-1

eg
sqrt[ (-2) ² ] = sqrt (4) = 2

MelodyNov 19, 2013

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How does this work (sqrt(2)-sqrt(8))^2 ?? plz expalain. why doesnt it become -6 or 6 and why is the answear 3??? ty for the answear in before hand

sqr8 = sqrt(4*2) = sqrt4 * sqrt2 = 2sqrt2

sqrt2 - 2sqrt2 = -sqrt2

(-sqrt2) ² = (-sqrt2)*(-sqrt2) = +2

MelodyNov 19, 2013

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Do you want more help for this question?
I actually did post a detailed answer but I think it came in at exactly the same time as the other reply and mine vanished.
I was a bit annoyed and I just posted the final answer.
If you need me to help more I can.
Let me see what you have done first though.

MelodyNov 19, 2013

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ok, Have fun, lol

MelodyNov 19, 2013

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how much would you have in the bank if you invested £2000 at an interest rate of 4% p.a, for three years?

If it is compounded yearly it will be

2000*1.04 ³ pounds

If it is compounded more often it will be a bit more.

MelodyNov 18, 2013

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MelodyNov 18, 2013

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Do you know hae many fluid ounces in a quart? I don't, we stop using imperial units in Australia in 1974.
I could google it an find out, but you could do that yourself.

MelodyNov 18, 2013

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log is base 10
ln is base e
Your calculator doesn't use any other bases.
You may need to use change of base law
Wikipeadia has a nice list of log laws that i still often refer to.

MelodyNov 18, 2013