Could someone please explain how to do this f(x) and graphing problem?

f(-3)  ....this says to go to x = -3 and read off the associated y value......at x = -3, f(x)  = y  = -1

f^-1(1)......note, we are looking for the x value on f(x) where y = 1........this is found at x = 0   ....so the point (0,1)  is on f(x)....then, the point (1,0) is on the inverse which is the same as f^-1(1)

The domain  of the inverse will = the range of the original function......this is the span of y values covered by the original function =  [ - 3, 3 ] .....note that -3 and 3 are both included in the domain of f^-1