The average fuel (in gallons) consumed by individual vehicles in the United States from 1960 to 2000 is modeled by the cubic equation
F(t) = 0.025t3 - 1.5t2 + 18.25t + 654
where t is the number of years since 1960.
a. When was the highest average fuel (in gallons) consumed during that period? What was the
average fuel consumed at that year?
b. At what year was the average fuel consumed the lowest during that period? What was the average
fuel consumed at the year?
c. Find the y-intercept and explain what it means.