need help with the following with an explanation

. . . X Use the variable u for the inside function to express each of the following as a composite function. (a) y = (7+2 -1)3 NOTE: u(t) is the inside function and y(u) is the outside function. u(t) = y(u) = (b) P = 9 e-0.5t NOTE: u(t) is the inside function and P(u) is the outside function. u(t) = P(u) = (c) C =6 In(94 + 2) NOTE: u(q) is the inside function and C(u) is the outside function. u(q ) = C(u) = End of document