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Model with composite functions


Mason is a captain of a tourist cruise to the Statue of Liberty. He saw and modeled the following relationships.
PDuration of the cruise, rAverage number of photos taken by each passenger, P(r)
DSpeed of the ship, kDuration of the cruise, D(k)
SRate of the river current, xSpeed of the ship, S(x)
The expression D(S(x)) represents which of the following?
Choose 1 answer: