Concept explainers
For Problems 64–65, assume g(v) is the fuel efficiency, in miles per gallon, of a car going at a speed of v miles per hour.
What is the practical meaning of
- (a) When the car is going 55 mph, the rate of change of the fuel efficiency decreases to approximately 0.54 miles/gal.
- (b) When the car is going 55 mph, the rate of change of the fuel efficiency decreases by approximately 0.54 miles/gal.
- (c) If the car speeds up from 55 mph to 56 mph, then the fuel efficiency is approximately −0.54 miles per gallon.
- (d) If the car speeds up from 55 mph to 56 mph, then the car becomes less fuel efficient by approximately 0.54 miles per gallon.
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