The cost C of building a house is related to the number k of carpenters used and the number x of electricians used by the following formula.† C = 15,000 + 50k2 + 60x2 (a) Assuming that 10 carpenters are currently being used, find the cost function C, marginal cost function C', and average cost function  C,  all as functions of x. C(x) =       C'(x) =       C(x) =       (b) Use the functions you obtained in part (a) to compute  C'(17)  and  C(17).  (Round your answers to the nearest cent.) C'(17) =$  __________________per spot C(17) =$ _______________ per spot Use these two answers to say whether the average cost is increasing or decreasing as the number of electricians increases. The average cost is increasing as x increases. The average cost is decreasing as x increases.

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