Answer
$3: 00 \ am$
Work Step by Step
$t=-10 \ln \dfrac{T-70}{98.6-70}$
We are given the model: $T=85.7$
$t=-10 \ln \dfrac{85.7-70}{98.6-70}$
or, $t=-10 \ln \dfrac{15.7}{28.6}$
or, $t \approx 6$
The person died 6 hours before 9:00 am.
Our answer is: 3: 00 am
