Answer: - 14.8
Explanation:
1. Add 5.7 to -12.4 to show the rise in tempature.
-12.4 + 5.7 = -6.7
2. add -8.1 to -6.7 to represent the drop in temperature. We are adding a negative since the temperature is dropping.
-8.1 + -6.7 = -14.8
I hope this helps :).