The value of the computer decreased exponentially throughout the five-year period. What was the average annual amount of decrease (in dollars per
year) over the two-year interval from t = 2 to t = 47

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.