A firework is launched from a platform above the ground and follows the path of the equation below where h=height in feet and t=time in seconds H(t)=-16 squared +64t +40

How long did it take the firework to reach it maximum height (Round to the nearest whole number)?

What was the highest point the firework reached?

How long was the firework in the air. (Round to the tenths place.)

What was the initial height of the firework?