3 ) 2. 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 ) =- 18(t+ 4)2+ 180(t+ 4), where the h is the height of the debris, in metres, and t is the time, in seconds. How long will it take for the debris to hit the ground after an explosion? Show all work. 3 3. A qulliq (kudlik) is an oil lamp that functions as the main source of heat and light for an igloo in the Inuit culture. It is made of soapstone shaped as a parabolic bowl that contains seal blubber for the oil. It is lined with arctic wool for the wick. If the length of the bowl is 40 cm and the height is 12 cm, determine the quadratic function that can be used to model the shape on a qulliq. Express the function in vertex form. (0,0) (40,0) (20,-12) Total = 19 Mathematics 20-2