Effect of Advertising on Sales After an advertising campaign, the sales of a product often increase and then decrease. Suppose that t days after the end of the advertising, the daily sales are f(t) = −3t2 + 32t + 100 units. What is the average rate of growth in sales during the fourth day, that is, from time t = 3 to t = 4? At what (instantaneous) rate are the sales changing when t = 2?
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