Which sequences are arithmetic? Check all that apply.
1, 2, 3, 4, 5, . . .
1, 3, 5, 7, 9, . . .
1, 1, 2, 3, 5, 8, . . .
256, 64, 16, 4, 1, . . .
4, 7, 10, 13, 16, . . .

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.