Answer:
The temperature at 5 am is 16 degrees below zero.
Explanation:
The temperature at 2 am is 9 degrees below zero:
![T_{2_(am)} = -9](https://img.qammunity.org/2021/formulas/mathematics/high-school/2jetia4ubt3slj8e72xygs1v1yrateorob.png)
Since at 5 am the temperature had dropped by an additional 7 degrees, we have:
![T_{5_(am)} = -9 - 7 = -16](https://img.qammunity.org/2021/formulas/mathematics/high-school/8c3urzdty15gmwrb90a9zasj8e63u3amv1.png)
Therefore, the temperature at 5 am is 16 degrees below zero.
I hope it helps you!