a small rock sits on the edge of a tall building. a strong wind blows the rock off the edge. the distance in feet, between the rock and the ground "t" seconds after the rock leaves the edge is given by

d=-16t^2-4t+472

How many seconds after the rock leves the edge is it 460 feet from the ground? _____________

if the answer is not an integer, show as a decimal. Round to the nearest hundredth if needed.

How many seconds after the rock leaves the edge does it hit the ground? ____________

if the answer is not an integer, show as a decimal. Round to the nearest hundredth if needed.