If F(x) and G(x) are two functions such that FG(x)) = x, then F(x) and G(x) are A. opposite functions
B. quadratic functions
C. complementary functions
D. inverse functions

answer: i feel you honey.

step-by-step explanation:

in counting the number of heads in 4 coin flips, the probability that we get exactly one head is the probability that we get anyone of the following 4 outcomes: httt, thtt, ttht, or ttth. each has probability 1/16, so the probability to get exactly one head in 4 flips is 1/16 + 1/16 + 1/16 + 1/16 = 4/16 = 1/4.