college algebra

3. A coroner arrives on the scene of a homicide at 10:00 pm in a temperature-controlled room, held at 70 degrees F. The temperature of the body is given by the function T(t) = 22.4e-0.0009t + 70, where t is time in minutes since 10:00 pm. Graph this function in an appropriate window. What happens to this function as time goes by? Why does this make sense? Use the graph to approximate the time of death, assuming that normal body temperature is 98.6 degrees F