Math please help with these problems!?

Question

1.) (r - 9s + 8) + (7r + 8s) + (s + 2)

2.) (6a)^4 * (6a)^9

3.) (5 - x)(4 - 7x)

Answer 1

Step one. Recycle math paper.

Step two. Kick math teacher in balls (Boob)

Answer 2

1) Group like terms

1r + 7r= 8r

-9s + 8s +1s= 0

8 + 2 =10

Answer is 8r + 10

2) 6a^4= 1296

6a^9= 10,077,696

1296 x 10,077,696= 1.306^10

Answer is 1.306a^10

3) Use the FOIL method (first, outside, inside, last)

5 * –x = -5x

5* -7= -35x

-x * 4= -4x

4 * -7x= -28x

Then just add them up -5x + -35x + -4x + -28x= -72x

Answer -72x

Answer 3

r-9s+8+7r+8s+s+2=  8r+10

(6a)^13

20-39x+7x^2