1. According to the query of homework help APP, in order to find out what is the temperature in Celsius corresponding to 98.7f, we need to know the conversion formula between Fahrenheit and Celsius first.

2. The relationship between Fahrenheit (F) and Celsius (C) can be expressed by the following mathematical formula: F is equal to (9 divided by 5) multiplied by C plus 32, which explains how to convert Celsius into Fahrenheit.

3. In order to find out the temperature in Celsius corresponding to 98.7f, we need to solve this formula and find out the value of C. The calculated result is that the temperature in Celsius is 37.06 degrees.