A person sitting in the top row of the bleachers at a sporting event drops a pair of sunglasses from a height of 24 feet. The function: h = -16x² + 24 represents the height h (in feet) of the sunglasses after x seconds. How long does it take the sunglasses to hit the ground? Please explain all of your steps. Your explanation should be good enough for a friend that missed the lesson. Pretend like you are teaching it to them.