100 POINTS + BRAINLIEST! HELP!!!
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= one over eighty x squared +20
(0, 10); y= one over one hundred twenty squared +10
(0,20); y= one over eighty x squared -20
(0, 10); y= one over one hundred twenty x squared -10