The function gives the cost to manufacture x items. C(x) - 20,000 + 80x + E; x - 100 X Find the avenge cost per unit of manufacturing h more items (i.e., the average rate of change of the total cost) at a production level of x, where x is as indicated and h - 10 and 1' (Use smaller values nfh to check your estimates.) HINT [See Example 1'] (Round your answers to two decimal places.) C(mn} = Need Help? a. 4.... anew" 2. Estimate the indicated derivative by any method. (Round your answer to three decimal places.) y = 6 x2; estimate dx x=_3