I need help how to write the points of discontinuity

1. (20 pt) For the following graph of function f(x), evaluate the following limits or determine they don't exist (assume that each line on the graph paper is 1 unit) (a) (5 pt) limx-+-3 f(x) (b) (5 pt) limx-of (x ) (c) (5 pt) limx-+3 f(x) (d) (5 pt) limx-too f(2 )