Short Answer
The gas mileage (miles per gallon, mpg) for a typical sedan can be approximated by the quadratic function
, where x represents the speed of the car in miles per hour (mph) and f represents the gas mileage in mpg. Find the instantaneous rate of change of the gas mileage of this sedan when the speed is 68 mph.
Correct Answer:

Verified
Correct Answer:
Verified
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