sing of a certai is given b where P is in dollars and M x is marginal cost in dollars per unit A Suppose the marginal cost at a production level of 500 units is 10 per unit and the cost of producing 500 units is 12 000 that is M 500 10 and P 500 12000 Use a tangent line approximation to estimate the cost of producing only 497 units B Suppose the production schedule is such that the company produces five units each day That is the number of units produced is x 51 where is in days and 0 corresponds the beginning of production Write an equation for the cost of production P as a function of time t