Let D(p) be the number of iced cappuccinos sold each week by a coffeehouse when the price is p cents. (a) What does the expression D(225) represent? (b) Do you think that D(p) is an increasing function or a decreasing function? Why? (c) What does the following equation tell you about p? D(p) = 180 (d) The coffeehouse sells n iced cappuccinos when they charge the average price in their area, t cents. Thus, D(t) = n. What is the meaning of the following expressions: D(1.5t), 1.5D(t), D(t+50), D(t)+50?
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