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  + 1.3 millions of dollars when the firm invests u thousand dollars in advertising. The firm plans to invest u(x) = −2.3x2 + 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 = 12? (Round your answer to three decimal places.)$   million per month

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter8: Linear Functions
Section8.7: Function Notation
Problem 44E
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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
 + 1.3 millions of dollars

when the firm invests u thousand dollars in advertising. The firm plans to invest

u(x) = −2.3x2 + 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 = 12? (Round your answer to three decimal places.)
$   million per month

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