How do you solve this ? i don't understand

Simplify (1/2)4th power a. (1/16) b.(1/8) c.(1/4)

What is the measure of one interior angle of a pentagon

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.