The document discusses the continuity of 6 functions over their domains. Function 11 and 12 are continuous over their entire domains of (-inf, inf). Function 13 is continuous over the domain [3, inf). Function 14 is continuous over the domain (-inf, -1]. Function 15 is discontinuous at x=3, so it is continuous over the intervals (-inf, 3) U (3, inf). Function 16 is discontinuous at x=1, so it is continuous over the intervals (-inf, 1) U (1, inf).