Answer:
To calculate the change in temperature, you need to subtract the temperature at 7 o'clock from the temperature at 3 o'clock.
Temperature at 3 o'clock: -8°F
Temperature at 7 o'clock: -17°F
Change in temperature = Temperature at 7 o'clock - Temperature at 3 o'clock
Change in temperature = (-17°F) - (-8°F)
Change in temperature = -17°F + 8°F
Change in temperature = -9°F
So, the change in temperature from 3 o'clock to 7 o'clock was a decrease of 9 degrees Fahrenheit.
Explanation: