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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There is a formula but I don't use it and I can never remember what it is because it is not necessary.

I'd just say (40/360)*2pi*r = 3000

Then just solve the equation.

MelodyOct 7, 2013

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Guest's Google translation - Russian to English

"First you say that that is the currency of "4106011" if "4106011" is in Russia, the Russian dollar "$ 127,635" and cents "0,35" ¢."

Hey Kem,
What does BTC stand for?

MelodyOct 7, 2013

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Minimization prob.jpg

MelodyOct 7, 2013

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if cscθ = x+6/x-2 and ctnθ = x+5/x-2 find θ

Hi Diaanaa,

I am having problems with your question.
Before I try further I just want to make sure that you meant

If Cosec(theta) = x + (6/x) - 2
and cotangent(theta) = x + (5/x) - 2
find theta

(We dont use the shortened versions csc and ctn in Australia, we use cosec and cot)

Please let me know if my interpretation of the question is correct.

MelodyOct 7, 2013

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Probabilities must be between 0 and 1 inclusive
If something cannot happen, the probability is 0
If something has to happen the probability is 1
So you probability of 3 doesn't make any sense.

Maybe you meant P(black or gold) = 3/7
There are 9 marbles that are either black or gold
Let there be x white marbles.
So the number of marbles altogether is 3+6+2+6+x = 17+x

so 9/(17+x) = 3/7
Now just solve it as a little equation to get the value of x.

MelodyOct 7, 2013

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no it doesn't have to be
example

root12 and root3 are both irrational but

root12/root3 = 2

MelodyOct 7, 2013

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Divide both sides by 2
Subtract 6x from both sides
Divide both sides by the number in front of the x (the x coefficient)
the answer will be negative.

MelodyOct 7, 2013

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The number of ways 5 numbers can be selected from 54 is
54C5 = 54!/(5!*49!) = 3162510

The number of ways you can select 4 things from 5 is 5C4 = 5

So the probability of being a small fry winner is 5/3162510

The probability of being any winner is 6/3162510

MelodyOct 7, 2013

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This is an irrational number unless your base is some power of 5 so the the best exact answer is
0.34log5

Ans yes, if you want an estimate and it is base 10 or base e do it on your calculator.

MelodyOct 7, 2013

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Sorry, your question does not make sense.

MelodyOct 7, 2013