A building rents for $5 per square foot, and there is an index of 1.5. The following year the index climbs to 1.8. The rent is tied to the index. What will the rent be per square foot?

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.