A rocket is propelled from the top of a building 30 meters tall so that its height in meters (t) seconds after it is launched is presented by the function: h(t)= -9.8t2 + 45t + 30.

Question

A rocket is propelled from the top of a building 30 meters tall so that its height in meters (t) seconds after it is launched is presented by the function: h(t)= -9.8t2 + 45t + 30. 
1)