If C(x) dollars is the total cost of manufacturing x chairs, and C(x) = x^2 + 40x + 800, find the average rate at which the cost changes for the first 20 chairs.
Added by Linda B.
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We need to find the rate at which the cost changes, which is the derivative of the cost function C(x). C'(x) = 2x + 40 Show more…
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