How were world war 1 and 2 similar?
both wars were fought across multiple continents (apex)

The correct answer is - Both wars were fought across multiple continents.

World War I and World War II were the biggest disasters that had happened to the humanity. Both wars ended up with millions of deaths, large portion of the dead being innocent civilians, economic downfalls, ruined countries. Both wars were also taking action on multiple continents, with the World War I being only on two, Europe and Asia, while the World War II had sides included from all continents apart from South America and Antarctica, with battlefields all across the globe, from the Pacific islands, to East Asia, North Africa, Europe, the Middle East...

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