Answer:
90 degrees
Explanation:
The question asks for the temp after an hour and a half. This is the same as 90 minutes. With this, you plug 90 in for t.
This is what it looks like:
T(t)=69e^-0.0174(90) + 76
Then you solve for T(t)
T(t)=69e^-1.566 +76
T(t)=69(0.2088) +76
T(t)=14.41265 +76
T(t)=90.41265
Then round to 90 degrees