The top of a building is 75 m above the ground. From the top of this building, a ball is thrown upwards at an initial speed of 9.8 m/s. The height h, in meters, of this ball above the ground, t seconds after the throw, is defined by the function h ( t ) = -4.9^2 + 9.8t + 45. Determine the domain and the range of the function.