The heights in feet of a base-ball after 1 seconds is s(t) = -16t 2 + 64t

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The heights in feet of a base-ball after 1 seconds is s(t) = -16t2 + 64t + 4. 

(a) Find the maximum height of the baseball. 

(b) For what values of t is the baseball 52 feet or more above the ground?

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