The given graph of the DERIVATIVE f' of a function f is shown. Answer the following questions only on the interval (-6, 6). 1. On what intervals is f increasing? Answer (in interval notation): 2. On what intervals is f decreasing? Answer (in interval notation): 3. At what values of x does f have a relative maximum? Answer (separate by commas): r - 4. At what values of x does f have a relative minimum? Answer (separate by commas): z =