intermediate algebra
posted by Nellie .
A model rocket Is launched from a height of 50ft. The formula h=16t^2+70t +50 describes the rocket's height,h,in feet seconds after it was launched. How long will it take the rocket to reach to reachthe ground?

intermediate algebra 
DonHo
When it's at the ground h = 0
16t^2+70t+50 = 0
using the quadratic formula
t=5
t=.625
t cannot be negative, so t=5s is the correct answer.
http://www.regentsprep.org/regents/math/algtrig/ate3/quadformula.htm
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