Identify the open intervals on which the graph of the function is increasing or decreasing. Assume that the graph extends past what is shown. 8- 6- 4- -10 --8 .. -2 0 -2 4 - 6 10 8- Note: Use the letter U for union. To enter oo, type infinity. Enter your answers to the nearest integer. If the function is never increasing or decreasing, enter NA in the associated response area. increasing: decreasing