1. Use the graph of $f(x)$ below to answer the following questions.
(a) What are the critical points of $f(x)$?
(b) Find the global extreme values of $f(x)$ on $[-6, 0]$.
(c) Where will $f(x)$ have local maxima on $[-6, 6]$?
(d) Where will $f(x)$ have local minima on $[-6, 6]$?
(e) Where will $f(x)$ be concave up?