In January, typical Fairbanks, Alaska temperatures are −2 degrees Fahrenheit during the day and −19 degrees Fahrenheit during the night. What is the temperature change from daytime to nighttime?

A -17°F.

explanation

To find the change in temperature, subtract the earlier temperature from the later temperature.
= - 19°F - (-2)°F
=-19°F +2°F = -17°F