Solve problem
Transportation According to the Federal Aviation Administration, the maximum recommended taxiing speed x (in miles per hour) for a plane on a curved runway exit is given by R = .5x2, where R is the radius of the curve (in feet). Find the maximum taxiing speed for planes on such exits when the radius of the exit is
(a) 450 ft
(b) 615 ft
(c) 970 ft
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