Which statement is true about potlatches? A. They were held only during the summer months.
B. They were hosted by craftspeople and laborers.
C. Participants exchanged gifts to show their families' status.
D. Participants ate small snacks that each family contributed

8 - (2a + 7) = a + 40     distribute/multiply - into (2a + 7)

8 - 2a - 7 = a + 40

1 - 2a = a + 40       add 2a on both sides

1 = 3a + 40         subtract 40 on both sides

-39 = 3a       divide 3 on both sides

-13 = a

[proof]

8 - (2a + 7) = a + 40

8 - (2(-13) + 7) = -13 + 40

8 - (-26 + 7) = 27

8 - (-19) = 27

8 + 19 = 27

27 = 27

the answer should be a. the sui empire, the tang empire extended from korea in the west to manchuria in the east.