For Item # 9 - 10: A company manufactures fuel tanks for automobiles. The total weekly cost of producing x tanks is described by the function, C (x) = 8000 + 90x + 10x. 9) Find the marginal cost function C, (x). A) 90 - 20x C) 20x-90 B) 20x + 90 D) -90- 20x

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A:

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A: This is a problem of optimization.

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