The number of miles per gallon you get in car is dependent on many thing, one of which is how fast you drive. Gas mileage is generally poor for people that drive very slow or very fast. The following chart shows the mile per gallon at various speeds for a certain vehicle. Speed (Miles per hour) Gas Mileage (Miles per Gallon)

5 12
15 22
25 27
35 29
45 30
55 29
65 26
75 21
85 13

Write an equation for the curve of best fit.
What two speeds will give you a gas mileage of of 25 mpg (miles per gallon)?