Jeongin kicks a stone off the edge of a tall cliff. The distance, d, between the rock and the ground t seconds after being kicked is d = -16t² -6t +480. How many seconds go by before the rock is at height of 424 feet above the ground?
mkay so I tried to solve it, but the factoring seems really off when I tried to find t. Is it really solvable or am I missing something? help would be appreciated thank youu :)