In triangle ABC, what is the measure of b if a = 6, C = 4, and B = 75°?

A. 5.64
B. 6.29
C. 6.78
D. 7.02

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.