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The gas mileage for a certain vehicle can be approximated by m=-0.02x2 +3.9x - 49


The gas mileage for a certain vehicle can be approximated by m=-0.02x2 +3.9x - 49, where x is the speed of the vehicle in mph. Determine the speed(s) at which the car gets 30 mpg. 


Round to the nearest mph. 


Part 1 

The car reached a gas mileage of 30 mpg twice 


Part 2

The vehicle will get 30 mpg at speeds of approximately _______ mph and _______ mph .

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