Final answer:
To calculate the change in temperature t, subtract the nighttime temperature from the daytime temperature. The result is 25°F, representing a decrease, so t = -25°F.
Step-by-step explanation:
The question asks how to find the change in temperature, represented by t, if one day, the temperature was 63°F and during the night, the temperature was 38°F. To find the change in temperature, you subtract the night temperature from the day temperature:
t = daytime temperature - nighttime temperature
t = 63°F - 38°F
t = 25°F
Therefore, the change in temperature, t, is 25°F. This is a decrease in temperature, so we consider it as a negative change, which gives us t = -25°F, which corresponds to option B).