The fuel economy in miles per gallon of a certain car


The fuel economy (in miles per gallon) of a certain car is E(x) = -0.01x2 + 0.52x +10.4, where x is the driving speed (in miles per hour, 20 ≤ x ≤ 60). At what speed is fuel economy greatest?

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Mathematics: The fuel economy in miles per gallon of a certain car
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