A projectile is launched from a platform 8 feet high

A projectile is launched from a platform 8 feet high with an initial
velocity of 72 feet per second, The height h of the projectile at t seconds after launch is given by
h = -16t 2 + 72t + 25 feet.
a) How many seconds after launch does the projectile attain maximum height?
b) ) What is the maximum height?

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