Answer
$22$ ft
Work Step by Step
$h=-16t^2+32t+6=-16(t^2-2t)+6=-16((t-1)^2-1)+6=-16(t-1)^2+16+6=-16(t-1)^2+22$
Thus the vertex of the graph is at $(1,22)$, and the maximum height is $22$ ft.
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