Given f(g(-5)) means that you take the number, -5, and substitute it into g(x) first. The answer provided from that equation will then be the number to be substituted in f(x).
x^2 + 4
-5^2 + 4
25 + 4 [It's positive because -5 x -5 cancels out to make a positive]
29 = g(x), therefore, this is the new number to be substituted for f(x)
We know that A and D will not be the correct answers. For A, it's only one 90 angles, but the questions said that has two angles. For D, it's two angles : 90 and 12, but in the question, 12 is the length, not the angle.
