Melody

921 Questions
34315 Answers

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Mathigon website

I just discovered a site called mathigon

https://mathigon.org/dashboard
और पढ़ें ..

Melody 2 Apr 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. और पढ़ें ..

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 और पढ़ें ..

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Melody 15 Mar 2022

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859

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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

और पढ़ें ..

विषय से परेे

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. और पढ़ें ..

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 और पढ़ें ..

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Melody 9 Jan 2022

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HAPPY BIRTHDAY CHRIS!

और पढ़ें ..

Melody 20 Des 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 और पढ़ें ..

विषय से परेे

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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

विषय से परेे

Melody 29 Okt 2021

+118691

0

A
And the radius is 3

Melody10 Jan 2014

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Good work Bliu1. I think that I have interpreted the words just a little differently from you,

John is 5 years older than Mary. This is the first equation on all 3 choices.

In 10 years, twice John's age decreased by Mary's age is 35,
In 10 years John will be (y+10) years and Mary will be (x+10) years so
2(y+10) - (x+10) = 35

and John's age (in 10 years time) will be twice Mary's current age. [ i take current age to mean her age today, not her age in 10 years time]
What does this sentence tell you?

Maybe there is more than 1 correct answer.
Find their ages now.
If x is Mary's age now and y is John's age now, which system of equations could not be used to solve the problem?

1. y = x + 5 and y + 10 = 2x
2. y = x + 5 and 2(y + 10)-(x + 10) = 35
3. y = x + 5 and 2(y + 10) = x

Melody10 Jan 2014

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Guest:
Simplify √110

You have to look for a square number, bigger than 1, that go into 110
Square numbers are 1,4,9,16,......
There are no square numbers that go into 110 therefore BLiu1 is absolutely correct, you cannot simplify sqrt(110)

Melody10 Jan 2014

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anon:
f(x) = -x^2 + -3x +10

The question didn't say but I assume that you are supposed to factorise this?

f(x) = -x ² - 3x +10

i'd start by factorising out -1

f(x) = -1 ( x ² + 3x -10)
f(x) = - ( x ² + 3x -10)

Now you need to find 2 numbers that multiply to give -10 and add to give +3
I can see immediately that one is neg and one is positive (mult to give neg) and the big one is the positive one (they add to a positive)
So straight away i can see it must be +5 and -2

F(x) = -(x+5)(x-2)

Note: whole numbers like 5 and -2 don't always exist.

If i had been thinking properly I would not have done this for you. I would have done a similar question and let you work this one out by yourself.
Arn't you lucky.

If you are keen, why don't you do this question for me.
factorise -2x ² + 8x + 10
Hint: The first thing that you should factorise out is -2

Melody10 Jan 2014

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adam:
2x + 3 = 9

The aim is to get x on one side by itself.
Start with things that are 'tacked on' that is numbers that are just added or subtracted after the x term
here you have +3 how do you get rid of +3 well, you take it away.
That is you start by subtracting 3 from BOTH sides.
Then you will need to think about how to get rid of the 2 and do it to BOTH sides.
Then you will have your answer.

Melody10 Jan 2014

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Already answered. Please don't post twice, I know it might have been an accident.

Melody10 Jan 2014

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what is 1.35714286 as a fraction

There is a really good explanation on this web page
and there are some practice questions at the end.

Just copy and paste it into you browser.

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

Happy Calculations

Melody10 Jan 2014

+118691

0

harriet best:
9(n+3)+7(n+6)=

I'll just give you a hint:

5(x+3) = 5*x + 5*3 = 5x+15
You have to expand the 2 brackets separately and then simplify the answer

Melody10 Jan 2014

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0

aaaaa:
sin (∞)=?

Undefined,
If you know what the graph looks like, just think about that.

Melody10 Jan 2014

+118691

0

JESUS MORETTI:
CUAL ES LA FORMULA PARA CALCULAR MONTO MENSUALIDADES DE UN PRESTAMO 20 AÑOSA UN INTERES FIJO_

WHAT IS THE FORMULA TO CALCULATE MONTHLY AMOUNT OF A LOAN INTEREST AN AGED 20 FIJO_
Hi Jesus,
I don't understand what the question is.
could you try to write it a different way please.
You probably need to give more information as well.

Hola Jesús,
No entiendo cuál es la pregunta.
podría tratar de escribir de una manera diferente por favor.
Es probable que tenga que dar más información también.

Melody10 Jan 2014