• An explosives company specializes in bringing down old buildings. The time it takes for a particular piece of flying debris to fall to the ground can be modelled by the function h(t)=−15(t+3)^2 +150(t+3) , where h is the height of the debris, in metres, and t is the time, in seconds. How long will it take for the piece of debris to hit the ground after an explosion? Show all work