change the question is: What is the average rate of change for this function for the interval from x= 2 to x = 4, the average rate of change is:

with the points (x1,y1) and (x2,y2)
in this case, when x=2 y= 4 so the point is (2,4)
and when x=4 y=16 (I'm seeing this from the table in the image)
so the points are (2,4) and (4,16)

so the answer is:
the average rate of change for this function for the interval from x= 2
to x = 4 is = 6