The function H(t)=-16t^2+64t+12 shows the height H(t), in feet, of a baseball after t seconds. Part A: What is the maximum height of the baseball? Explain the maximum height using seconds and feet.

Part B: What is the velocity (speed) of the ball? What is the starting height of the ball?

Part C: When does the baseball hit the ground? Explain using seconds and feet.