The marketing department at Texas Instruments has found that when certain calculators are sold at a price of p dollars per unit, the number x of calculators sold is given by the demand equation x = 21,000 – 150p (a) Find a model that expresses the revenue R as a function of the price p. (b) What is the domain of R? (c) What unit price should be used to maximize revenue? (d) If this price is charged, what is the maximum revenue? (e) How many units are sold at this price?

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A: Given information Error = 0.045 Confidence level = 0.99