Exploring Domain and Range of a Rational Function

Explore the domain and range of a rational function.
What happens to the graph as the input value approaches -275 from the left? What happens to the graph as the input value approaches -275 from the right? Check "Show Line." What occurs on the graph when the input is exactly -275? How does this affect the domain of the function? Check "Show Output." What occurs on the graph when the output is exactly 120? How does this affect the range of the function?