Mahum

Hello, It's me...I know that you do not know me but still hiiiii!

-5(-8n-9)-6n

40n+45-6n    Use the distributive property

40n-6n+45    Combine like terms

=34n+45       And thats just as far as you can simplify because 34n is not a like term to 45.

2-(-2)

2+2

=4

Here's how it works, when you have 2 negative signs right next to eachother they turn into plus/posotive and you just add the numbers but remmber this only applies if you have two negative RIGHT next to each other x-(-y) but if you have something like -2-(-2), your answer would be 0 because you are adding becuse there are 2 negatives next to each other but that first 2 isn't corresponding with any other negative signs.

Hope I helped!!! 

Start with the Parenthasis first then when thats solved go on to the division

10

move the decimal 2 to the left.

.124

7 1/3

like 4x + 9= 12x?