1. Graph of a function is shown. a) If this graph shows y = f(x), what are the x-coordinates of critical numbers of f(x)? b) If this graph shows y = f'(x), what are the x-coordinates of critical numbers of f(x)? Answer: (a) = -2.5, -2, -1.5,0, 2; (b) x = -3, -2, -1,2