using Newton's Law of Cooling: At 10:30 am the medical examiner arrives at a crime scene where a dead body has been found. The temperature of the body is 80 degrees F and the thermostat for the room in which the body was found is set at 68 degrees F. One hour later the temperature of the body is 78.5 degrees F. When did death occur?

Question

using Newton's Law of Cooling:  At 10:30 am the medical examiner arrives at a crime scene where a dead body has been found.  The temperature of the body is 80 degrees F and the thermostat for the room in which the body was found is set at 68 degrees F.  One hour later the temperature of the body is 78.5 degrees F.  When did death occur?