Answer:
![25^(o)F](https://img.qammunity.org/2019/formulas/physics/high-school/4urwihlenndtwaie85hy4ynr8uaiu8f9zi.png)
Temperature is a measure of hotness or coldness. Different scales are used to measure it like - celsius, fahrenheit and kelvin.
The temperature at 5 p.m. is
and at 10 p.m. it is
![-5^(o)F](https://img.qammunity.org/2019/formulas/physics/high-school/5noqbrsp0d306dponuwyg9fhbe84azbhxv.png)
We can determine the fall in temperature by calculating the difference in the temperature.
![\delta T=20^(o)F-(-5^(o)F)\\ \Rightarrow \delta T=25^(o)F](https://img.qammunity.org/2019/formulas/physics/high-school/esu9onm30ei31lkndqfc7c0owt4d2emlo2.png)
Hence, the fall in temperature is
![25^(o)F](https://img.qammunity.org/2019/formulas/physics/high-school/4urwihlenndtwaie85hy4ynr8uaiu8f9zi.png)