A tennis ball is thrown into the air from the top of a hotel

Last updated: 7/12/2022

A tennis ball is thrown into the air from the top of a hotel that is 216 feet above the ground. The height of the ball from the ground is modeled by D(t) = 16t² + 10t + 216 feet where t is the time, in seconds, after the ball is thrown. How long after the ball is thrown does it hit the ground?