The equation y=-0.0088x2+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?

Question

Mathematics

Karissa Hood

25 April, 08:28

The equation y=-0.0088x2+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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Answers (1)

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Shaun Drake · Answer 1

Answer: 30.72 miles per gallon

To find best approximate for the average gas mileage at a speed of 60 miles per hour you need to replace the variable x with 60. The calculation would be:

y=-0.0088x2+0.79x+15

y = - 31.68 + 47.4 + 15

y = 30.72