Melody

921 Questions
34315 Answers

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Mathigon website

I just discovered a site called mathigon

https://mathigon.org/dashboard
mehr ..

Melody 02.04.2022

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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. mehr ..

Melody 16.03.2022

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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 mehr ..

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Melody 15.03.2022

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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 13.03.2022

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WELCOME BACK CPHILL !

Melody 11.02.2022

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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. mehr ..

Melody 01.02.2022

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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 mehr ..

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Melody 09.01.2022

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HAPPY BIRTHDAY CHRIS!

Melody 20.12.2021

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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 mehr ..

Off-Topic

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Melody 04.11.2021

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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 29.10.2021

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Melody15.10.2013

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It's a bit mor complicated than that.
because the saver will get interest on her interest that has already been paid - as well as interest on her deposits.
but you are right, an interest rate has to be given and an exact time period.
Even considering these problems, the question didn't make a lot of sense.

I actually think it may have been translated into English and something was lost in the translation.
or maybe Lil_Rosey has English as a second language.

Is this the case Lil?

Melody15.10.2013

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firstly,
(0.0000004)(60,000)/(0.00002)(1,500,000)
means
[(0.0000004)(60,000)/(0.00002)] * (1,500,000)
is this what you intended?

What is your real problem, can't you do it on your calculator?
Don't you understand what you calc is outputing?
Do you need to do it by hand?
Do just want someone to give you the answer and explain nothing?

If you ask a specific question you are more likely to get the answer that you really want or need.

Melody15.10.2013

+118725

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Why can't you just cut the tiles that don't fit.
I have a tile cutter in my shed.
You could just have 5 tiles,
One for each side and one for the bottom.
the longest side is 11.34m so that is how long the tile would need to be.

of course, 22543, your interpetation is probably more what the teacher had in mind.

Melody15.10.2013

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Melody15.10.2013

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22543's answer is really good but it might be easier for you if you split it into 2separate equations when you take the square root.

3m+4=13 OR 3m+4=-13

then solve each one separately and at the end choose the answer/s that meet the condition m<0

Melody15.10.2013

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Ok
Our guest has made a careless mistake leaving out a minus sign on the second last row (and last row). Other than that trivial error, the maths is good.
It is slightly different from my method but it is still good.
It is not quite finished.
If you fix up the minus sign then there is a difference of 2 squares on the top that can be factorised,
then there is some cancelling that can be done and the final answer is much simpler.

Melody15.10.2013

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You do it with a 'hanging tree'
Put 440 at the top and any 2 of its factors underneath. If either of those 2 factors is prime then put a circle around it and that branch is finished,
start on a new row
Put any 2 facors of each non prime number above. etc untill all the branches are finished
I made the prime factors bold.

440
10 x 44
2 5 11 4
2 2

440 = 2 * 5 * 11 * 2 * 2
The prime factors of 440 are 2, 5, and 11
This forum won't allow me to add spaces so it doen't look like I wanted it to, but hopefully you get the idea and will do it yourself next time.

Melody15.10.2013

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cos is adjacent / hypotenus

And, it is cosine not cosinus

Maybe remember

some old hags sin=o/h
cant always hide cos=a/h
their old age tan=o/a

Melody14.10.2013

+118725

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translation / перевод

Tanya and her friend have to inscribe 450 konvertov.Tanya inscribes 46 envelopes per hour and her friend 42.skolko envelopes will inscribe them in 2 hours working together

I have translated this but the translation does not make much sense.
What do 'skolko' and 'konvertov' mean?

Я перевел это, но в переводе не имеет особого смысла.
Что 'Skolko »и« konvertov "означает?

Melody14.10.2013