t=3-√ 43/2=-1.63 and 3+√ 43/2=7.63
and since time can't be negative, it hits the ground at 7.63 seconds.
and then for 3 there are two steps. Use t=−b2a to find the time of max height. Then plug that time into the h(t) equation
the same values you used in the quadratic equation a = -16, b = 96, c = 200
t=−962(−16)
344 is the answer.