posted by Nate
The fuel efficiency for a certain midsize car is given by
E(v) = −0.018v^2 + 1.440v + 3.9 where E(v)is the fuel efficiency in miles per gallon for a car traveling v miles per hour.
(a) What speed will yield the maximum fuel efficiency? Round to the nearest mile per hour.
(b) What is the maximum fuel efficiency for this car? Round to the nearest mile per gallon.
find the derivative, set it equal to zero and solve.