Final answer:
To determine the temperature difference, the Christmas temperature is subtracted from the Father's Day temperature. The result is 80.7 degrees Fahrenheit, which means Father's Day was 80.7 degrees Fahrenheit warmer than Christmas in Bay City.
Step-by-step explanation:
To find out how much warmer it was in Bay City on Father's Day than on Christmas, we need to calculate the difference in temperatures between these two days. Father's Day had a temperature of 78.6 degrees Fahrenheit, and on Christmas, the temperature was -2.1 degrees Fahrenheit.
To calculate the difference, we subtract the Christmas temperature from the Father's Day temperature:
78.6 degrees Fahrenheit (Father's Day) - (-2.1 degrees Fahrenheit (Christmas)) = 78.6 + 2.1 = 80.7 degrees Fahrenheit
Therefore, it was 80.7 degrees Fahrenheit warmer on Father's Day than on Christmas in Bay City.