Answer:
-5.4 degrees
Step-by-step explanation:
First get the time passed by subtracting 2:00 pm from 8:00 pm, which will give you 6 hrs, you can then multiuply 6 hrs by -3.4 (temp changed per hr) and you will get -20.4. You then add together -20.4 and 15 to get -5.4 degrees.
