Sam has thrown a ball up into the air. The height H(in meters) that the ball is above the ground after time t is given by

H(t)=-1.6t^{2}+24t where t is the time in seconds

a)Find the
time that will yield maximum
height. What is the maximum height? (round to nearest
whole meter) To yield maximum height t (in seconds)=

b)What is the maximum height? (round to nearest whole meter)

Maximum height: H (meters)=