a. The domain is the x values so to find the domain used to graph
you need to determine what values this piece is defined for. From the piece-wise defined function,
is defined for −1 b.
If you are finding f(4), then \(x=4\).
From the piece-wise defined function, the domain that includes \(x=4\)
is \(2\leq x<\).
This domain is for the piece of \(f(x)=3x\).
Therefore, the equation \(f(x)=3x\) is used to find \(f(4)=12\).