SOLUTION: please help me solve a rock is thrown from the top of the building . The distance in feet, between the rock and the ground t seconds after the rock is thrown is given by d=-16t^

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Question 865416: please help me solve
a rock is thrown from the top of the building . The distance in feet, between the rock and the ground t seconds after the rock is thrown is given by d=-16t^2-34t+15. How long after the rock is thrown does it hit the ground? THANK YOU!!!

Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
h=-16t^2-34t+15
plug in 0 for h and solve for t
0=-16t^2-34t+15
t = 3/8 seconds