ANSWER
5°F/hr
Step-by-step explanation
At 3 a.m., the temperature was -13°F and at 10 a.m., the temperature was 22°F.
To find the average change in temperature per hour, we first have to find the number of hours between 3 a.m. ad 10 a.m.
There are 7 hours between 3 a.m. and 10 a.m.
Then, find the change in temperature by subtracting the initial temperature from the final temperature:
Finally, find the average change in temperature per hour by dividing the change in temperature by the number of hours:
That is the answer.