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A plane flying horizontally at an altitude of 2 mi and a speed of 480 mi/h passes directly over a radar station. Find the rate at which the distance from the plane to the station is increasing when...

A rectangular box with a volume of 320ft^3 is to be constructed with a square base and top. The cost per square foot for the bottom is 15 cents for the top is 10 cents and for the sides is 2.5 cents...

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