dT/dt=� k(T �- Tm), t >� 0
where k is a constant of proportionality, T and Tm are measured in degrees Fahrenheit,
and time t is measured in hours. Because Diff wants to investigate the past using positive
values of time, he decides to correspond t � 0 with 6:00 A.M., and so, for example,
t � 4 is 2:00 A.M. After a few scratches on his yellow pad, Diff realizes that with this time convention the constant k in (1) will turn out to be positive. Diff jots a reminder to himself that 6:30 A.M. is now t=-1/2.
After much deep thought Diff decides to begin by assuming that Mr. Wood was murdered inside the refrigerator. What is the estimated time of death?