Domain and Range - Definition & Finding Graphically

The United States and a few other countries are the only countries in the world that use Fahrenheit as the official measurement of temperature. All other countries use Celsius or Kelvin to measure temperature. People in the United States often need to know how to convert Celsius to Fahrenheit to understand temperature. The function to convert Celsius to Fahrenheit is $F=(1.8 \times C) + 32$. If the range of equation is from the freezing point in Fahrenheit to the boiling point in Fahrenheit, $[32,212]$, what is the domain (the freezing point to the boiling point in celsius) of the function based on the graph above?