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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Thank you Nauseated

I would but I would not want to test you checking ability. Plus, I am helping Chris look for the Roman zero so I am a bit busy at present.

MelodyJun 24, 2015

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YES

http://web2.0calc.com/questions/for-a-positive-integer-n-phi-n-denotes-the-number-of-positive-integers-less-than-or-equal-to-n-that-are-relatively-prime-to-n-wh

So the set includes 1, 5, 7 and 11 ?

MelodyJun 24, 2015

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There are many threads in here. 12/5/15

http://web2.0calc.com/questions/my-watchlist-is-exploding

http://web2.0calc.com/questions/limx-0-x-1-1-x-e-x

http://web2.0calc.com/questions/show-that-7-p-6-p-1-for-p-3-prime-is-multiple-of-43

Great number theory by Bertie 25/6/15

http://web2.0calc.com/questions/let-the-term-s_n-be-the-sum-of-the-first-n-powers-of-2-for-instance-s_3-2-0-2-1-2-2-7-find-the-largest-possible-value-of

Another private watchlist 30-6-15

http://web2.0calc.com/questions/melody-s-new-private-watchlist-30-6-15

Mellie question: 150709 Diophantine equation maybe

http://web2.0calc.com/questions/for-a-positive-integer-n-phi-n-denotes-the-number-of-positive-integers-less-than-or-equal-to-n-that-are-relatively-prime-to-n-wh

Mellie question: Another diophantine equation 150709

http://web2.0calc.com/questions/use-the-euclidean-algorithm-to-find-integers-x-and-y-such-that-164x-37y-1-state-your-answer-as-a-list-with-x-first-and-y-seco

Mellie question: Another diophantine equation 150709

http://web2.0calc.com/questions/you-have-a-machine-that-can-add-exactly-46-899-pieces-of-candy-per-scoop-to-a-giant-vat-and-another-machine-that-can-remove-exactly-13-576-p

Mellie question: Another diophantine equation 150709

http://web2.0calc.com/questions/four-positive-integers-nbsp-nbsp-nbsp-nbsp-and-nbsp-nbsp-satisfy

Mellie questions

http://web2.0calc.com/questions/mellie-and-dabae-questions-page-1903-i-just-want-this-for-my-watchlist

MelodyJun 24, 2015

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Thanks Nauseated but surely no two even numbers can be coprime even if one of them is 2.

Heureka's last answer seemed to include two.

I think the question was how many co-prime numbers are there of 12 and x where x is a positive integer less than 12.

I thought these would be 5,7, and 11 BUT Heureka said that there were 4 of them :(

I assume he was including 2, but why would 2 be included?

MelodyJun 24, 2015

+118723

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Sir-Emo is right

This is how you can do it on any scientific calculator

$$\\y=2 ^{2017}\\
logy=log2 ^{2017}\\
logy=2017*log2\\$$

$${\mathtt{2\,017}}{\mathtt{\,\times\,}}{log}_{10}\left({\mathtt{2}}\right) = {\mathtt{607.177\: \!501\: \!254\: \!250\: \!080\: \!4}}$$

$$\\logy=607.1775012542500808\\\\
y=10^{607.1775012542500808}\\\\
y=10^{0.1775012542500808}\times 10^{607}\\\\$$

$${{\mathtt{10}}}^{{\mathtt{0.177\: \!501\: \!254\: \!250\: \!080\: \!8}}} = {\mathtt{1.504\: \!877\: \!864\: \!909\: \!905\: \!7}}$$

$$2^{2017}=1.5048778649099057\times 10^{607}$$

MelodyJun 24, 2015

+118723

+5

$$\\(9x)^2/3+(2y)^2/3+z^2/3\\\\
=(9*9*x^2)/3\quad +\quad(2*2y^2)/3\quad +\quad z^2/3\\\\
=\frac{81x^2+4y^2+z^2}{3}$$

MelodyJun 24, 2015

+118723

+5

Hi MG,

You like answering algebra questions but sometimes it is very obvious that you do not understand the basic concepts behind them.

Here are a set of adding like terms video clips.

I think this address is for the middle one in the series. The early ones are probably too easy.

Take a look and see if you can get anything out of it :)

Stop the video sometimes and try to answer the questions yourself before the answer is given :)

https://www.khanacademy.org/math/algebra-basics/core-algebra-expressions/core-algebra-manipulating-expressions/v/combining-like-terms-2

MelodyJun 24, 2015

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Hi anon,

I like people answering like you did, if you get involved it means you are much more likely to learn yourself, or maybe someone will learn from you. :)

I always think it is ultimately the askers decision to accept or reject an answer so if they copy your wrong answer they is not your fault.

(This assumes everyone answers in good faith of course)

MelodyJun 24, 2015

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I really like this explanation Sir-Emo

MelodyJun 24, 2015