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A railroad tunnel is shaped like a semiellipse, as shown below. X The height of the tunnel at the center is 35 ft, and the

A railroad tunnel is shaped like a semiellipse, as shown below. X The height of the tunnel at the center is 35 ft, and the vertical clearance must be 21 ft at a point 8 ft from the center. Find an equation for the ellipse. (5 points)

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