graph
Which of the following statements are true about the function graphed here? Select all that apply.

The mathematical function has an absolute minimum at x = 15.
The domain of the mathematical function shown in the graph is all real numbers.
The average rate of change of the function between x = 20 and x = 25 is 0.
The domain of the mathematical function shown in the graph is all values of x such that 0 ≤ x ≤ 20.
The mathematical function is decreasing for all values of x such that x > 15.
The mathematical function is increasing for all x such that 15 < x < 22.