math calculus

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The marginal cost of a product is modeled by

dC/dx= 16/cube root 16x + 3
where x is the number of units. When x = 17, C = 120.
(a) Find the cost function. (Round your constant term to two decimal places.)
c=

(b) Find the cost of producing 90 units. (Round your answer to two decimal places.)
$

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