The marketing division of a large firm has found that it can model the sales generated by an advertising campaign as S(u) = 0.75/u + 1.7 millions of dollars when the firm invests u thousand dollars in advertising. The firm plans to invest u(x) = -2.8x2 + 52x + 150 thousand dollars each month where x is the number of months after the beginning of the advertising campaign. How quickly will the sales for this firm be changing when x = 18? (Round your answer to three decimal places.) %24 million per month

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