For many species of fish, the weight W is a function of the length L that can be expressed by W = W(L) = kL³    k = constant

Suppose that for a particular species, k = 0.03 and that for this species, the length (in centimeters) is a function of the number of years t the fish has been alive and that this function is given by L = L(t) = 65 - 0.1(t - 25)²     0 ≤ t ≤ 25

Find (W  L)(t) to express W as a function of the age t of the fish.