If you are examining a function over an interval (a, b), for a and b finite, is it possible not to have an absolute maximum or absolute minimum?

Graph each function over a two-period interval.y = sin (x + π/4) | Study Prep in Pearson+

Use the given graph of f over the interval (0, 6) to find the following.101AX(a) The open intervals on which f is increasing. (Enter your answer using interval notation.)(b) The open intervals on which f is decreasing. (Enter your answer using interval notation.)(c) The open intervals on which f is concave upward. (Enter your answer using interval notation.)(d) The open intervals on which f is concave downward. (Enter your answer using interval notation.)