A company's total sales (in millions of dollars) t months from now are given by
5(t) = 0.015t4 + 0.4t3 + 3.4t2 + 10t - 3
(A) Find S'(t).
(B) Find 5(4) and 5'(4) (to two decimal places). Write a brief verbal interpretation of these results.
(C) Find S(8) and Sʹ(8) (to two decimal places). Write a brief verbal interpretation of these results.