Question 1030778
I think you mean
{{{h(t) = 64t - 16t^2}}}
It reaches its maximum height when v = 0.  That occurs when t = 2 seconds.  We know that because g = -32 feet/sec/sec.
Anyway, at t = 2,
{{{h(2) = 64*2 - 16*2^2 = 128 - 64 = 64}}} feet