The marginal cost of a product is modeled by dC dx C = where x is the number of units. When x = 15, C = 140, (a) Find the cost function. (Round your constant term to two decimal places.) (14x+3)(3) 3 =3 2 14 14x + 3 + K (b) Find the cost (in dollars) of producing 60 units. (Round your answer to two decimal places.) $

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