A detective is called to the scene of a crime where a dead body has been found. She arrives at
10pm and immediately records the temperature of the body to be 80◦F. One hour into her
investigation she measures the temperature of the body to be 76◦F. She notes that the
thermostat is programmed at a constant 68◦F. Assuming that the victim’s body temperature
was normal(98.6◦F) prior to death, when did the death occur?
solve for r first