The daily sales S (in thousands of dollars) that are attributed to an advertising campaign are given

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The daily sales S (in thousands of dollars) that are attributed to an advertising campaign are given by
3 S= 1+ 18 (t + 3)? t+3

where t is the number of weeks the campaign runs.
(a) Find the rate of change of sales at any time t.
(b) Use the second derivative to find how this rate is changing at t = 15.
(c) Interpret your result in part (b).

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