Question 203282
Graph:
{{{h(t) = -16t^2+112t+92}}}
{{{graph(400,400,-5,10,-5,290,-16x^2+112x+92)}}}
When h (vertical axis) = 0, t = 7.75 approximately.
So the rocket will hit the ground (h = 0) in about 7.75 seconds after launch.