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QUESTION
A plane flying at an altitude of 4.0 mi is at a direct distance D= (16.0+x^2) from an airport control tower, where x is the horizontal distance to...
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A plane flying at an altitude of 4.0 mi is at a direct distance D= √(16.0+x^2) from an airport control tower, where x is the horizontal distance to the tower. If the plane's speed is 330 mi/h , how fast id D changing when x=6.4mi?
D is changing at a rate of ___ mi/h.
(Do not round until the final answer. Then round to the nearest ten as needed.)
