SOLUTION: This one has me confused. I keep getting an answet with the t still in it so I can not round it like the question wants The height h in feet of an object after t seconds is give

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equation Customizable Word Problems -> SOLUTION: This one has me confused. I keep getting an answet with the t still in it so I can not round it like the question wants The height h in feet of an object after t seconds is give      Log On


   

Question 96680: This one has me confused. I keep getting an answet with the t still in it so I can not round it like the question wants
The height h in feet of an object after t seconds is given by the function
h = –16t^2 + 80t + 6.
How long will it take the object to hit the ground? Round your answer to the nearest thousandth.
Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
what will h be when it hits the ground? Ans. 0
-16t^2+80t+6=0
multiply both sides * -1
16^t-80t-6=0
Quadratic formula:
t=5.074... and t=-.074
discard the negative root.
t=5.074 sec
Ed