1. Replace the x with each of the 2 options first. First, work out f(16)=4x-8. You get 56 when your done (just use a TI-84)
Then work out f(0)=4x-8. You get -8 when your done.
56-8=48. Your answer is B.
2. Work it out as: h(3)=-16*3^(2)+128*3+144
Using this, you get 384. Your answer is once again B