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For a new car, the gas mileage in terms ...

For a new car, the gas mileage in terms of its speed x is modeled by the function `G(x)=-1/28x^2+3x-31` , where `15 le x le 90`, and x is speed in miles per hour and G is miles per gallon. At what speed, in miles per hour, does the car attain its best gas mileage ?

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