49. Advertising and sales Suppose that the daily sales (in dollars) t days after the end of an advertising campaign are given by S = 1000 + 400 t + 1 t≥ 0 Does S increase for all t≥ 0, decrease for all t≥ 0, or change direction at some point?

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A: Note:- Since you have asked multiple question As per our policy, we will solve the first question…

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A: The price p and the quantity q sold of a certain product obey the demand functionq=-20p+500; 0≤p≤25