h = 48 + 32x - 16x squared

a) from what heigh above the ground was the balloon thrown?

48 feet, its the y

b) how many seconds does it take for the balloon to reach its maximum height??

c) what is the max height above the ground does the balloon reaches?

d) how many seconds will it take before the balloon hits the ground???

calulated to be 3 seconds

how would i go about doing b and c? thank you for your help