Melody

921 Questions
34316 Answers

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Mathigon website

I just discovered a site called mathigon

https://mathigon.org/dashboard
read more ..

Melody Apr 2, 2022

-8

612

1

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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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8

1481

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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

-3

873

3

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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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888

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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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999

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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

+118735

0

It is not 3.5 it is 3/2 which is 1.5

MelodyJan 22, 2015

+118735

+3

Yes fair enough :)

MelodyJan 22, 2015

+118735

+8

@@ End of Day Wrap Thurs 22/1/15 Sydney, Australia Time 10:20 pm

Hi all,

Today our wonderful answerers were Sasini, CPhill, Geno3141, Tetration, Lemoncrush14, Tenacious, Happy7, eli101, Fieldmouse830, Saseflower and Heureka. Thanks you

I would really like people to suggest interst posts for the wraps. You can just send the addresses to me via private message. I would really like that.

Interest posts:

1) Why isn't anyone answering our questions

http://web2.0calc.com/questions/why-isn-t-anybody-responding-to-the-questions-there-are-a-lot-of-questions-out-there-waiting-to-be-answered-i-cannot-help-either-because-i

2) A good trig problem. (Suggested by Chris) Double thanks Chris

http://web2.0calc.com/questions/from-one-point-on-the-ground-the-angle-of-elevation-to-the-top-of-a-tree-is-measured-at-36-degrees-from-another-point-20-feet-closer-the

3) Venn diagrams are fun - Thanks Chris

http://web2.0calc.com/questions/set-theory-with-venn-diagrams-and-percentages

♫♪ ♪ ♫ ♬ ♬ MELODY ♬ ♬ ♫♪ ♪ ♫

MelodyJan 22, 2015

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0

Fri 23/1/15

CONGRATULATIONS TO HEUREKA

Heureka is now on the Top Answerers Board !!! I am so pleased.

Heureka you are an extremely valued member of our answer team.

A puzzle Thanks Chris

http://web2.0calc.com/questions/7-11

How you can find powers when the numbers are too big for most calculators - Thanks Geno.

http://web2.0calc.com/questions/what-is-2-4000

What is $$-4^2$$ and why. Lots of confusion here! Heureka and Melody

http://web2.0calc.com/questions/why-does-4-2-equal-16-and-not-16

What is Pascal's Triangle. A curiosity website :) Thanks Chris

http://web2.0calc.com/questions/what-is-pascal-s-triangle

♫♪ ♪ ♫ ♬ ♬ MELODY ♬ ♬ ♫♪ ♪ ♫

MelodyJan 22, 2015

+118735

+5

I've started answering it. Now I have asked you to try the next bit.

MelodyJan 22, 2015

+118735

+5

Let one of the angles be x and the other by 17x

x+17x=90

now solve :)

MelodyJan 22, 2015

+118735

+5

You start by taking it all to one side

$$\\X^2+7x=18\\
X^2+7x-18=0$$

now I would like either the question asker or Tenacious to factorize the left hand side for mw please.

Hint1: You need 2 numbers that mult to -18 and add to +7

Hint2: What will the signs of these numbers be?

MelodyJan 22, 2015

+118735

+5

https://www.google.com.au/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=meaning+of+integral

MelodyJan 22, 2015

+118735

+5

Well there is an infinit number of solutions if there are no restrictions on the domain.

There is one in the first quad and one in the second quad but you can add 360n degrees or 2npi radians

where n is any integer.

MelodyJan 22, 2015

+118735

+5

Well if you are given 1 side and the opposite angle and one other thing then you can use sine rule to find the 4th thing.

If you are given 2 sides and the angle between them OR if you are given 3 sides and you need to find something else then you would use Cosine Rule.

I think that those instructions will work each time

Sometimes you need to do more than one step and sometimes you could use either.

Chris would you like to comment on this one?

MelodyJan 22, 2015