You throw a ball straight up from a rooftop x, seconds after y, ball's height, in The ball misses the rooftop on its way down the ball is feet, above the and eventually strikes the ground. A thrown ground mathematical model can be used to describe 169 the relationship for the ball's height above the 3 161 ground, y, after x seconds. 109 a. Find the quadratic function y = ax + bx + c whose graph passes through the given points. y