For the function [math] whose graph is given, state the value of the given quantity, if it exists. If it does not exist, enter "n" below.

(a) [math]
(b) [math]
(c) [math]
(d) [math]
(e) [math]
(f) [math]
(g) [math]
(h) [math]
(i) [math]
(j) [math]
(k) [math]
(l) [math]

(a)
(b)
(c)
(d)
(e)
(f)
(g)
(h)
(i)
(j)
(k)
(l)