Airport runway The relative positions of an aircraft run- way and a 20-foot-tall control tower are shown in the figure. The beginning of the runway is at a perpendicular distance of 300 feet from the base of the tower. If x denotes the dis- tance an airplane has moved down the runway, express the distance d between the airplane and the top of the control tower as a function of x. Exercise 77 20' 300'

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