As a mathematics professor loads more weight in the back of his Subaru, the mileage goes down.

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As a mathematics professor loads more weight in the back of his Subaru, the mileage goes down. Let x be the amount of weight (in pounds) that he adds, and let y = ƒ(x) be the mileage (in mpg).
(a) Is ƒ′(x) positive or negative? Explain.
(b) What are the units of ƒ′(x)?

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