Domain and Range of a Function-interval notation

Domain and Range of a Function
What is the domain and range of f1, in interval notation?
What is the domain and range of f2, in interval notation?
What is the domain and range of f3, in interval notation?
Using the drawing box below, graph an example of a piece-wise function that has domain [math]\left(-\infty,5\right)\cup\left[6,9\right][/math]
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Information: Domain and Range of a Function-interval notation