The equation y=−0.0088x^2 + 0.79x +15 models the speed x (in miles per hour) and average gas mileage y (in miles per gallon) for a vehicle. What is the best approximate for the average gas mileage at a speed of 60 miles per hour?

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1 Answer
Jim G.
Feb 1, 2018

#30.7" miles/ gallon"#

Explanation:

#"to evaluate for y substitute x = 60 into the equation"#

#rArry=-0.0088xx(color(red)(60))^2+(0.79xxcolor(red)(60)+15#

#color(white)(rArry)=-31.68+47.4+15#

#color(white)(rArry)=30.72~~30.7" miles/gallon"#

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