These tables represent an exponential function. Find the average rate of change for the interval from x= 7 to x = 8.
Interval

A. 2187
B. 6561
C. 3
D. 4374

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.