1. Let C(x) = ax² + 2bxr + = for positive constants a, b, c, be the cost of producing z items. (i) Determine the marginal cost dC and the average cost T(x) = C(x) dr (ii) Determine the rate of change of average cost dr For what values of r is < 0 for r in terms of a,b,c. dr average cost decreasing? That is solve (iii) Determine the values of r for which average cost is greater than marginal cost. That is solve C(x) > dC for r in terms of a, b, c. dr

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