Here's how you can convert Fahrenheit to Celsius:
1. First, we need to subtract 32 from the Fahrenheit temperature.
For 5F, we would do 5 - 32 to get -27.
For 39F, we would do 39 - 32 to get 7.
2. The next step in our conversion process is to multiply the result by 5/9.
For -27, we would do (-27 * 5/9) to get -15.
For 7, we would do (7 * 5/9) to get approximately 3.888888888889, but we want our result rounded to the nearest tenth of a degree. Thus, we round this value to 3.9.
So, to convert 5F to Celsius you get -15C and to convert 39F to Celsius you get 3.9C.