15, 16

15. Use the graph of f in the figure to find the following values or state that they do not exist. If a limit does not exist, explain why. a. f(1) b. lim f(x) c. lim f(x) d. lim f(x) x->It x-1 YA 2 y = f(x) 1 X 16. What are the potential problems of using a graphing utility to esti- mate lim f(x)? x-a