Melody

921 Questions
34315 Answers

+1

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Mathigon website

I just discovered a site called mathigon

https://mathigon.org/dashboard
lire plus ..

Melody 2 avr. 2022

-8

610

1

+118725

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. lire plus ..

Melody 16 mars 2022

-2

8

1459

5

+118725

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 lire plus ..

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Melody 15 mars 2022

-3

871

3

+118725

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

Hors sujet

Melody 13 mars 2022

-4

850

3

+118725

WELCOME BACK CPHILL !

Melody 11 févr. 2022

-5

717

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+118725

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. lire plus ..

Melody 1 févr. 2022

-7

890

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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 lire plus ..

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Melody 9 janv. 2022

-6

1

996

3

+118725

HAPPY BIRTHDAY CHRIS!

Melody 20 déc. 2021

+5

16

5554

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+118725

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 lire plus ..

Hors sujet

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Melody 4 nov. 2021

-9

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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

Hors sujet

Melody 29 oct. 2021

+118725

0

-4/5 + (- 1/3)

= -4/5 + - 1/3

If 2 signs (+ or -) are so close together that you can put a circle around them without anything else inside the circle
then
if the signs are the same, replace with a plus
if the signs are different, replace with a minus.

= -4/5 - 1/3

then, either find a common denominator and solve that way or just do it on your calculator.
If doing by hand,
consider -8-6 = -(8+6) = -14

Melody10 oct. 2013

+118725

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Amortization 131010.jpg

Melody10 oct. 2013

+118725

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thrown stone 131010.jpg

Melody10 oct. 2013

+118725

0

Maybe you mean
what is the cube root of -125 in which case the answer is -5 because -5*-5*-5 = -125

there is a cube root button on your calculator or you can use.
Also a cube root is a power of 1/3
so
(-125)^(1/3) should also give you the correct answer.

Melody10 oct. 2013

+118725

0

It is 3 ^5(root5)i

BUT at high school level it is fair to say that the square root of a negative number does not exist so there is no answer.

Melody10 oct. 2013

+118725

0

I'm sorry but this question doesn't make sense.

Melody10 oct. 2013

+118725

0

Parallel to y=3x-4 and through the point (0,5)

The gradient of y=3x-4 is 3
any line parallel must also have a gradient of 3
Now there is more than one way to continue;
you could just say y=3x + b
sub in (0,5) to find b
then just write the equation answer down.

Is this enough help?

Melody10 oct. 2013

+118725

0

Speed of sound at sea level is approx 340.29 m/s
340.29m/s * 5.6sec = 1905.624m (the secs cancel out)
1.906km

there is about 5/8 mile in one km (a mile is further than a km)
1.906 * (5/8) = 744 miles

Melody10 oct. 2013

+118725

0

your answer isn't correct

I think the question is
y = (x-1) (rootx - 2)

y= x(rootx - 2) - 1(rootx - 2)
=xrootx - 2x - rootx +2

now, rootx = x to the power of 1/2
xrootx = x ¹x ^1/2 = x ^(1+1/2) = x ^(3/2)
so
y= x ^(3/2) -2x -x ^(1/2) + 2

Melody10 oct. 2013

+118725

0

5(-1)+4(-3(-1))
=-5 + 4*3
=7

Melody10 oct. 2013