The daily sales S (in thousands of dollars) that are attributed to an advertising campaign are given by 3 t + 2 17 (t + 2)² where t is the number of weeks the campaign runs. S = 4 + (a) Find the rate of change of sales at any time t. S' = (b) Use the second derivative to find how this rate is changing at t = 15. (c) Interpret your result in part (b). The-Select--- in sales (after 15 weeks) is the amount given in part (b).

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