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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+1

MelodyMar 22, 2014

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0

asley8273:
how do i do a problem like this 1/2(w-4)

You have asked 1/2 * (w-4) = (w-4)/2

is this what you mean or is the real question 1/[2(w-4)] ?

You need to use brackets to get the question correct and to make sure that we understand what you are asking.

MelodyMar 22, 2014

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Guest:
How do you factor expressions in the form ax (to the second power) + bx + c?

We could help more if you give us an actual example.

Anyway,
Try working through this page.

http://www.mathsisfun.com/algebra/factoring-quadratics.html

MelodyMar 22, 2014

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Hi Bertie,

Considering that we don't have Latex here, I think that you have done a very good job of presenting this.
I do have a couple of little suggestions. I think that I would like to include other people in this so I will talk about it in my nightly wrap.
I'll do this either tonight or in the very near future.

Welcome to the forum Bertie I sent you a private message to welcome you ages ago, when you first joined up. I know that you haven't collected it yet.
I wrote a lot more here but I have decided to include it in tonight's wrap instead. Other new people need to know about the mail system as well.

Thanks you for this post. I am so glad that you decided to join in.
Melody.

edit.
The message information is not in tonight's wrap afterall - I'll probably include it tomorrow!

MelodyMar 22, 2014

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Alan:
pmcclure:
is there a way to factor polynomials on this calculator? thanks

you can try using the keyword "factor". For example:
factor(x^2-2x-3)

Thank you Alan.
I have just added this to the 'Buttons above the smilies' thread. Maybe I should rename that thread. I'll think about it.
Anyway thanks for all you fantastic input. I really appreciate it.

MelodyMar 22, 2014

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kbby:
how to change a fraction to a percent

Thankyou for that great explaination Sam.
kbby you may like to look at this page. It gives info but also a chance to answer some questions to check that you understand.

http://www.mathsisfun.com/converting-fractions-percents.html

MelodyMar 22, 2014

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fuzzybuzz:
6x² + 5x - 4 / 8x³ - 12x² + 6x - 1

Do you mean

(6x² + 5x - 4) / (8x³ - 12x² + 6x - 1) ?

MelodyMar 22, 2014

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Stu:
How do I find a midline on a graph, from an equation? it is 2y=acos (bx+c)+d

Hi Stu,

y = (a/2)cos[b(x+(c/b)] + d/2

midline y= d/2

amplitude = a/2

period = 2pi/b

phase shift = c/b to the left

I have plotted a graph to show you what is happening. The two graphs start the same. Move the sliders to show you what happens as the letters change in value.
I hope that you understand what I am trying to show you.
If I or someone else, can explain further, let us know.

https://www.desmos.com/calculator/gozti03ke3

Another source of information
http://math.ucsd.edu/~wgarner/math4c/textbook/chapter5/shift_trig_func.htm

MelodyMar 22, 2014

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find limit of sequence (16/9^n)+17 arctan(n^6)

lim as n tends to [size=150]∞[/size] of 16/9 ⁿ=0

lim as n tends to [size=150]∞[/size] of arctan(n^6) = pi/2

therefore the answer is 17pi/2

MelodyMar 22, 2014