The x intercept (spelled with a "c", not an "s") is any point where the function curve either touches or crosses the x axis. The x axis is the bold flat horizontal line. This axis is often labeled with an "x" in many diagrams.
For problem 22, the x intercept is the point (-4,0) as this is where the S shaped curve crosses through the horizontal x axis. See the attached diagram for a visual of what I'm talking about. Note the highlighted point in red.