Final answer:
The total change in temperature last night, after dropping 3°F every hour for 3 hours, is represented by the integer -9°F.
Step-by-step explanation:
The temperature last night dropped 3°F every hour for 3 hours. To represent the total change in temperature during this time, we need to multiply the hourly temperature drop by the number of hours.
Total change in temperature = Hourly temperature drop × Number of hours
Total change in temperature = 3°F/hour × 3 hours
Therefore, the total change in temperature is 9°F. Since the temperature dropped, this change is negative, which gives us a total change of -9°F.