Use interval notation to write the intervals over which f is (a) increasing, (b) decreasing, and (c) constant. Part 1 of 3 The function is never increasing. The function is sometimes increasing. Increasing interval: The function is always increasing. Increasing interval: The function is never decreasing. The function is sometimes decreasing. Decreasing interval: The function is always decreasing. Decreasing interval: The function is never constant. The function is sometimes constant. Constant interval: The function is always constant. Constant interval