we are given
[tex] y=-0.0088x^2+0.79x+15 [/tex]
where
y is average gas mileage in miles per gallon
x is speed in miles per hour
we have to find average gas mileage at a speed of 60 miles per hour
so, we have
[tex] x=60mph [/tex]
now, we can plug it and find y
[tex] y=-0.0088(60)^2+0.79(60)+15 [/tex]
we get
[tex] y=30.72 [/tex]
so,
the best approximate for the average gas mileage at a speed of 60 miles per hour is 30.7 mi/gal...........Answer
