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10. For the cost function, find the marginal cost at the given production level x. C(x) = 15,000 + 10x - 10,000 , *=1,000 a. $10.20 per item b. $10.00 per item c. $9.78 per item d. $9.80 per item e. $9.81 per item 11. Find the derivative of the function. f(x) = x2 - 4) a. x x2 - 4) b. ( 2 x ) N/W C . x 4 d. 5x x2 - 4) 2 12. A company has cost function C(x) = 1000+ 20x + x2 . Find: The minimum average cost. Round your answer to nearest dollar. 13. Let f(x) = In(In(x) ) . Find the value off'(e). a. b. 1+e - C. d. e . f. In 2 g. O h. p 2 14. Find the derivative of the following functions: f(1) = te' 13 + 1