Help please! With explanation

A company's total cost, in millions of dollars, is given by C(t) =80 - 40e * where t is the time in years since 150- 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) 75- b) C (0) c) C (5) d) Find lim C(t) and lim C (t). 15 30 a) C'(1) = (Do not include the $ symbol in your answer.)