Adead body was found within a closed room of a house where the temperature was a constant 70° f. at the time of discovery the core temperature of the body was determined to be 80° f. one hour later a second measurement showed that the core temperature of the body was 75° f. assume that the time of death corresponds to t = 0 and that the core temperature at that time was 98.6° f. determine how many hours elapsed before the body was found. [hint: let t1 > 0 denote the time that the body was discovered.] (round your answer to one decimal place.)