The heights in feet of a golf ball after 1 seconds is given by s(t) = -16t

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The heights in feet of a golf ball after 1 seconds is given by s(t) = -16t2 + 80t. 

(a) After how many seconds did the golf ball strike the ground? 

(b) For what values of t is the golf ball 64 feet or more above the ground?

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