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Mathematics 14 Online
OpenStudy (anonymous):

A manufacturer produces bolts of fabric with a fixed width. The quantity q of this fabric (measured in yards) that is sold is a function of the selling price p (in dollars per yard), so we can write q = f(p). Then the total revenue earned with selling price p is R(p) = pf(p). Given f(18) = 9000 and f '(18) = −320, find R'(18).

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