This graph represents f '(x) -- the first derivative Use a number line analysis of this graph of a first derivative to determine when the original function f(x) is increasing and decreasing. O decreasing: (2, infinity) increasing: (- infinity, -1) & (-1, 2) increasing: (- infinity, infinity) increasing: (-1, 1) decreasing: (- infinity, -1) & (1, infinity) O increasing: (2, infinity) decreasing: (- infinity, -1) & (-1, 2)