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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what is the expanded natation of (-4a) to the power of 4

It is (-4)^4 * a^4

can you do the rest?

MelodyOct 16, 2013

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No that is not correct

just put 2 divided by 3 times 357 into your calc and you'll get the right answer.

MelodyOct 16, 2013

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I assume you mean

(-1/5)*x-4>-3

add 4 to both sides
then multiply both sides by negative 5 but remember that when you multiply or divide by a negative number you have to turn the sign around.

MelodyOct 16, 2013

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Yes I think that is true but it is not true to say it the other way around

I say 'I think' because I am open to contradiction.

MelodyOct 16, 2013

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tan(2x) is undefined or discontiunuous for x=(pi/4)+-(pi/2)k where k is any integer

y = lnx has the domain x>0

so now considering
y=ln(tan(2x))

tan(2x)>0
true for
0 < x <pi/4
2pi/4 < x < 3pi/4
4pi/4 < x < 5pi/4

etc, this is where it is defined, NOT where it is NOT defined.

so It is not defined for

-pi/4 <= x <= 0
pi/4 <= x <= 2pi/4
3pi/4 <= x <= pi etc

I think this is

(pi/4) +- (pi/2*k) <= x <= (pi/2) +- (pi/2*k) Where k is an integer
I think that this is where the function is undefined.

I also plotted it using http://rechneronline.de/function-graphs/

I think that the graph supports my conclusion but I will admit that I havn't looked at it that hard.

y=ln(tan2x).JPG

MelodyOct 16, 2013

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It is already in fraction form
Put the 9 on the bottom. A divide sign or divide line is the same as a fraction line.

MelodyOct 16, 2013

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MelodyOct 16, 2013

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What is your question?

MelodyOct 16, 2013

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You can't SOLVE it because it is NOT an equation because there is NO equal sign

MelodyOct 16, 2013

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subtract to find the increase in price in dollars
then
it will be
dollar increase / original price * 100 %

MelodyOct 16, 2013