Keilantra spots an airplane on radar that is currently approaching in a straight line,
and that will fly directly overhead. The plane maintains a constant altitude of 7500
feet. Keilantra initially measures an angle of elevation ofa9° to the plane at point A. At some later time, she measures an angle of elevation of 34° to the plane at point B. Find the distance the plane traveled from point A to point B. Round your answer to
the nearest foot if necessary.