Determine the intervals on which f is increasing or decreasing, assuming that given figure is the graph of f' . Only consider the portion of the graph on the interval (0, 6). X (Give your answers as intervals in the form (*, *). Use the symbol co for infinity, U for combining intervals, and an appropriate type of parenthesis "(",")", "[","]" depending on whether the interval is open or closed. Enter O if the interval is empty. Express numbers in exact form. Use symbolic notation and fractions where needed.) f is increasing on f is decreasing on