(Answered) What is the fuel efficiency

Statistics

Problem: The fuel efficiency F for a particular car is given by F(x) = -0.02 x2 + 1.56 x + 9.8 where x is the speed of the car in miles per hour (mph) and F(x) is the corresponding fuel efficiency in miles per gallon (mpg).

Required:

Question 1: What is the fuel efficiency if the car's speed is 70 mph?

Question 2: What speed will yield the maximum fuel efficiency?

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