you were called in as a mathematical expert. upon your arrival on the scene at 2:15am, you find that the...

you were called in as a mathematical expert. upon your arrival on the scene at 2:15am, you find that the temperature of the guard's body is 88.4 F. the police state that the temperature of the guard's body when they arrived 60 minutes before was 90.2 F. the storage facility has a constant temperature of 68 F maintained 24 hours a day. additionally, the plutonium-239 that was used has a half life of 8.78 hours. when no longer maintained at the 68F of the storage facility, it begins to decay, and once it decays to only 18% of its original amount, it can react with the oxigen in the air and explode.

1. determine the time of death of the guard