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Mathematics 11 Online
OpenStudy (anonymous):

A plane that is flying horizontally at an altitude of 4 kilometers and a speed of 690 kilometers per hour passes directly over a radar station. How fast is the distance between the plane and the radar station increasing when the distance between the two is 16 kilometers

OpenStudy (anonymous):

With this problems it is a good idea to draw a picture |dw:1383544490357:dw| \[D^2 = x^2 + 4^2\]

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