The ratio of the lengths of the radii of two spheres is 5 : 8. What is the ratio of the surface area of the smaller sphere to the surface area of the larger sphere?

1
5
8
25
40
64
125
512

In the diagram, the ratio of ab to ae is (1/2) . what is the ratio of the length of to the length of ?

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

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning