Melody

921 Questions
34315 Answers

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Mathigon website

I just discovered a site called mathigon

https://mathigon.org/dashboard
lee mas ..

Melody 2 abr 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. lee mas ..

Melody 16 mar 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 lee mas ..

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Melody 15 mar 2022

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858

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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

Fuera tema

Melody 13 mar 2022

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WELCOME BACK CPHILL !

Melody 11 feb 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. lee mas ..

Melody 1 feb 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 lee mas ..

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Melody 9 ene 2022

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HAPPY BIRTHDAY CHRIS!

Melody 20 dic 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 lee mas ..

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Melody 4 nov 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

Fuera tema

Melody 29 oct 2021

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Melody26 nov 2013

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It is too huge for your calc to compute.
But, the smallest digit will be 5

Melody26 nov 2013

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what is angle if opposite is 20 and hypotenuse 770?

It will be a very tiny angle

sin(theta) = 20/770

inv sin (2/77) = 1 degree 29minutes and 18seconds

Melody25 nov 2013

+118690

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x/9 = 8/12 I dont understand this or 1/4 x= 6

x/9 = 8/12
Write these fractions upright.
Now you need to get rid of the 9 on the left hand side so if you multiply by 9/1 it will cancel out.
If you multiply the left by 9/1 you have to multiply the right side by 9/1 as well.

x/9 * 9/1 = 8/12 * 9/1

x = 72/12

x = 6

The other one is similar , you will need to multiply both sides by 4

This you tube clip may help you.
I think you should look at it.

http://www.youtube.com/watch?v=vk4CP10bys0

Melody25 nov 2013

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I answered this question for 1 of your classmates.

Melody25 nov 2013

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if i am spending $345.00 and tax is 6% or .06 what is my tax

0.06 * $345

or

6/100*$345

Melody25 nov 2013

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(1-0.2)x1.5+3.6/3

why don't you understand it? I could answer better if I understood your problem better.

you have to do the brackets first
then you do times and divide - they are equally important just do them from, left to right. The fraction line is a divide sign. (1/2 = 1 divided by 2 : they are the same thing)
last you do the addition
so you should have the question and 3 lines of working.

Show me your working now and I will tell you if it is correct.

Or , if you just do it on the calculator exactly as it is written you will get the correct answer.

Melody25 nov 2013

+118690

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How can you add brackets in this question?
5x3-2x10-3=47

I just realised what your question really was sorry, I got a bit carried away.

maybe just

5x3 - 2x10 -3 = 47

5x3 -3 -2x10 = 47

5x3 - 1x3 -2x10 = 47

5 lots of 3 takeaway 1 lot of 3 = (5-1) lot of 3 = 3 lots of (5-1) = 3 x (5-1)

5x3 - 1x3 -2x10 = 47
3 x (5-1) - 2 x10 = 47

Is that more what you had in mind?

Melody25 nov 2013

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How can you add brackets in this question?
5x3-2x10-3=47

do you mean 5x^3 - 2x^10 - 3 = 47 ?

If you want to factorise properly you would change it to
You'd change it to 2x^10 - 5x^3 +50 = 0
then look for factors.
The only possible rational factors are +- ( 1,2,5,25,50,0.5,2.5, 12.5) Using rational root theorem

Using remainder theorem I can see that;
no minus one will work so that halves the possibilities
2 or bigger won't work
1 doesn't work
0.5 doesn't work
so there are no rational roots so I can't factorise

However, I suppose you could say

5x^3 - 2x^10 - 3 = 47
x^3(5 - 2x^7) = 50
It wouldn't be very useful for anything but it does have brackets and it is true.

Melody25 nov 2013

+118690

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Translation
Why the calculator is not available in several languages and so only in English? Because personally, it would be much more understandable if the calculator had been programmed in several languages.

Yes, I think non-English speaking people often have to be much cleverer than people who speak English as a first language do.
Sometimes the impediments don't seem fair or necessary.
I sympathise with you.
I hope this translates well.

Oui, je pense que les personnes non anglophones de langue doivent souvent être beaucoup plus malin que les gens qui parlent anglais comme une langue première.
Parfois les obstacles ne semblent pas juste ou nécessaire.
Je compatis avec vous.
J'espère que cela se traduit bien.

Melody25 nov 2013