This is an math/way answer, and I don't have an explanation to the problem, but I hope this is good enough.
Answer:
I got 58, I hope the picture helped
F(x) = x-3 and g(x) = x+11
f(x) *g(x) = (x-3)(x+11) = x^2 +11x -3x -33 = x^2 +8x -33
so choice D. is right
hope helped
20/2.5 = 8
So 8 movies can be shown in 20 hours.