Final answer:
The temperature at 5:00 pm is 2° F and it drops by 11° F by 8:00 pm. Therefore, the new temperature at 8:00 pm is -9° F.
Step-by-step explanation:
The student is asking about a change in temperature measured in degrees Fahrenheit and wishes to know the new thermometer reading after a 3-hour drop. At 5:00 pm, the temperature is 2° F. Over the next three hours, the temperature falls by 11° F. To find the temperature at 8:00 pm, we subtract the decrease in temperature from the initial temperature.
Initial temperature = 2° F
Temperature drop = 11° F
New temperature = Initial temperature - Temperature drop
New temperature = 2° F - 11° F = -9° F
Therefore, the integer that represents the thermometer reading at 8:00 pm is -9° F.