f[$) = 5 3311(3) costs) on {17,1r] a) Find the critical numbers of f. C] {Separate multiple answers by commas.) b) Determine the intervals on which f is increasing and decreasing. f is increasing on: f is decreasing on: c) Use the First Derivative Test to determine whether each critical point is a relative maximum, minimum, or neither. Relative maxima occur at :1: 2 {Separate multiple answers by commas.) Relative minima occur at :1: 2 (Separate multiple answers by commas.)