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A plane flying at an altitude of 2 0 mi is at a direct distance D = 14 0 + x- from an airport control

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A plane flying at an altitude of 2 0 mi is at a direct distance D = 14 0 + x- from an airport control tower, where x is the horizontal distance to the tower If the plane speed is 360 mi/h, how fast is D changing when x = 7.1 mi? D is changing at a rate of mi/h (Do not round until the final answer. Then round to the nearest ten as needed )

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