A railroad tunnel is shaped like a semi-ellipse. The height of the tunnel at the center is 18 ft and the vertical clearance must be 12 ft at a point 5 ft from the center. Find an equation for the ellipse. x² OA. 25 = 1 324 x? О в. 324 = 1 45 y² Oc. = 1 45 324 x? y? OD. 45 = 1 144

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