If a ball is thrown upward at 64 feet per second from the top of a building that is180 feet high, the height of the ball can be modeled by feet,

If a ball is thrown upward at 64 feet per second from the top of a building that is180 feet high, the height of the ball can be modeled by  feet, where t is the number of seconds after the ball is thrown. What is the ball's maximum height?