The fuel economy of a car, measured in the miles per gallon, is modeled by the function f(s)= -0.0009s^2+ 0.699s+12 where s represents the average speed of the car, measured in miles per hour. what average speed results in the maximum fuel economy? a. -38.83 miles per hour b. 38.83 miles per hour c. 3.88 miles per hour d. 25.57 miles per hour

we are given

where

s represents the average speed of the car in miles per hour

For maximum fuel economy , we will have to find derivative of f(s)

and then we set it to 0

after that we can solve for s

now, we can set it to 0

and then we can solve for s

mph....................Answer

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Step-by-step explanation: