The first picture answer is H, because you plug in (-2/3) for x in the equation.
Im not sure what you are asking for in the second picture, but I think the answer is (3,8) if you are looking for a point, or 7 if you are just subtracting 12 from 5.
The third picture answer is x=20, because you you look at the table and find f(30), you will see across from it will be x=20
For the last picture the answer is F.) because you plug in all the numbers and will get the answer choice F.