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Can you explain how to solve this step-by-step? Thank you. 3. The fuel used by a car is defined by f(x)=3x2/80-6x+245, where x is the

Can you explain how to solve this step-by-step? Thank you.

3. The fuel used by a car is defined by f(x)=3x2/80-6x+245, where x is the travelling speed in km/h. What is the most economical speed of the car? In other words, determine the speed of the car which uses the least amount of fuel

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