Melody

I got the same answer as you Chris.

There is an error in the question.

😕

I have not made a personal aquaintance with them.  Sorry   

Take a  look at this - it is a good starting point I think.  

Thank you all for making me smile.  ☺

3y(2y-3x)

that's the answer

Thanks Chris,

I used GeoGebra :)

You can do a lot of things with GeoGebra but it is not very intuitive so I am still learning.

Like with most things, the more you know the easier it is to learn more. :)

18+(-22)+4+(-9)

= 18+ - 22 +4 + - 9

now if the  + or - signs are SO CLOSE together that you can put a circle around them without anything else in the circle then   

If the signs are the same replace them with a +

If the signs are different replace them with a    -

So the question becomes

18-22+4-9

Start at 18 on the number line.

Go 22 in the neg direction that will get you to -4

Now go 4 in the pos direction and that will get you to 0

then go 9 in the neg direction and that will get you to -9

@@ End of Day Wrap     Sat 10 /1/15     Sydney, Australia       Time 4:30pm       ♪ ♫

Hi everyone,

Today our great answerers  were Tetration, CPhill, Heureka, geno3141, happy7, Shaniab29544 Alan and Rosala.     Thanks everyone.

I think there are some chemistry and physics questions left to answer - if anyone wants to have a go.   

Interest posts:

1) Limit.         Melody

What about it?  It can't be simplified.  

Sun 11/01/14

1) Prove $${\sqrt{{\mathtt{10}}}}$$   is irrational.           Melody