The projectile

Dawson kicked a football from the ground and it followed the projectile h(t)=-15t^2+150t where t is the time in seconds, and h is the height of the ball in feet. Answer the following questions about the scenario:
How long was the ball in the air when it was at its maximum height? Round to two decimal
places if needed.
b) What is the maximum height the ball reached? Round to two decimal places if needed.
c) How long was the ball in the air? Round to two decimal places if needed.
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