Suppose the dollar cost of producing x video cameras is C(x) = 500x − 0.003x2 + 10−8x3. Estimate the marginal cost at production level x = 6500. (Round your answer to three decimal places.) $ Find the actual cost C(6501) − C(6500). (Round your answer to three decimal places.) $ Find the average cost per camera at x = 6500. (Round your answer to three decimal places.) $