What is the rule for 5,10,20,40,80

idk but i found this "the graph of y = f(x-2) is the graph of y = f(x) translated two units rightward.  

so, since the point (9,2) lies on the graph of y = f(x), the point (11,2) lies on the graph of y = f(x-2)."

step-by-step explanation:

link is

a reflection across the x-axis , followed by the by a reflection across the y-axis , and then a scale dilation of 0.5 .