A skateboard halfpipe is being designed for a competition. The halfpipe will be in the shape of a parabola and will be positioned above the ground such that its focus is 30 ft above the ground. Using the ground as the x-axis, where should the base of the halfpipe be positioned? Which equation best describes the equation of the halfpipe? (0, 60); y equals one over two hundred forty times x squared minus 60 (0, 60); y equals one over two hundred forty times x squared plus 60 (0, 15); y equals one over sixty times x square minus 15 (0, 15); y equals one over sixty times x squared plus 15