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Suppose that the manufacturer of a gas clothes dryer has found that when the unit price is p dollars, the revenue R (in dollars) is R(p) = -6p² + 18,000p. (a) At what prices p is revenue zero? (b) For what range of prices will revenue exceed $2,400,000? www (a) At what prices p is revenue zero? The revenue equals zero when p is $ 3000,0. (Use a comma to separate answers, but do not use commas in any individual numbers.) (b) For what range of prices will revenue exceed $2,400,000? (Type your answer in interval notation. Round to the nearest cent as needed.) Solve b