Use interval notation to write the intervals over whichfis (a) increasing, (b) decreasing, and (c) constant. O The function is never increasing. 0 The function is sometimes increasing. Increasing interval: [1 O The function is always increasing. Increasing interval: [1 O The function is never decreasing. O The function is sometimes decreasing. Decreasing interval: D O The function is always decreasing. Decreasing interval: D O The function is never constant. 0 The function is sometimes constant. Constant interval: D O The function is always constant. Constant interval: CI