In which era did the Mississippian period occur? 11,000-8,000 BCE
8,000–1,500 BCE
1,000 BCE-1,000 CE
800–1,600 CE

i believe that the answer is

800 -1,600 CE

im pretty sure it has something to do with the end of ww1

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