Mathematics, 23.04.2021 17:30 andaws21

PLEASE HELP 50 POINTS :) 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 40 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, 20); y equals one over eighty times x squared plus 20
(0, 10); y equals one over one hundred twenty times x squared plus 10
(0, 20); y equals one over eighty times x squared minus 20
(0, 10); y equals one over one hundred twenty times x squared minus 10

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