How do I solve this?
ht^2=-0.6t^2+4t
you solving for h? Then h = (-0.6t^2+4t)/t^2
or, solving for t,
ht^2 + 0.6t^2 - 4t = 0
(h+0,6)t^2 - 4t = 0
t(h+0.6)t-4) = 0
t=0 or t=4/(h+0.6)
Actually, I suspect a typo.
ht^2=-0.6t^2+4t
or, solving for t,
ht^2 + 0.6t^2 - 4t = 0
(h+0,6)t^2 - 4t = 0
t(h+0.6)t-4) = 0
t=0 or t=4/(h+0.6)
Actually, I suspect a typo.