A company's total cost, in millions of dollars, is given by C(t) = 80-70et where t is the time in years since the start-up date. The graph of C(t) is shown to the right. Find each of the following. a) The marginal cost, C'(t) b) C'(0) c) C'(4) d) Find lim C(t) and lim C'(t). 81 81 a) C'(t)=(Do not include the $ symbol in your answer.) Ay 150- 75- 0+ 0 15 30