20-(2x6) +8 divided by 4
2 times 6 = 12
8/4 = 2
20-12+2
It would be 14 not 29
He used PEMDAS in the wrong order
There are many ways to solve this. I think the easiest way for this one is to add the equations up.

The you solve that, now that y is gone. You get x=2.
Now plug in x into one of the original equations.

Finish solving, and you get y=8.
The answer is (2,8)
Ya I think it is also the second one
Odd functions go up and down in the ends
even function either go up on both ends or down on both end ,
so i think the answer would be :
since n is odd and a is positive , the end behavior is up and down
hope this helps
If you factor it then your answer will be -3(-3z-5) if you simplify the answer is 9z+15