Chapter 8.5, Problem 38E

Baseball Henry is standing on a platform overlooking a baseball stadium. It is 160 feet above the playing field. When he throws a baseball upward at 64 feet per second, the distance d from the baseball to the ground after t seconds is given by the function $d(t)=-16t^2+64t+160$. What is the maximum height of the baseball if he throws it upward? How many seconds does it take until the ball finally hits the ground? (Round your answer to the nearest

tenth.)