The figure above shows the graph of S', the derivative of a twice-differentiable function f, on the interval [-3, 4]. The graph of f' has horizontal tangents at x = -|, x = 1, and .x = 3. The areas of the regions bounded by the x-axis and the graph of S' on the intervals [-2, I] and [1, 4] are 9 and 12, respectively. (a) Find all x-coordinates at which f has a relative - 3 -2 -1 maximum. Give a reason for your answer. (b) On what open intervals contained in -3