Part B Write the introduction paragraph of your research paper. The introduction should include brief background information about your topic. It should also include a clear thesis statement. Because this will be an explanatory paper, the thesis should explain your topic clearly to your audience. Read about how to write a good thesis statement.

Please help me! This is one question that a really need. I will give brainliest to whomever gives a strong and helpful response!​

a. because the u.s. was the leading with the most technology, economy, etc. also was teamed with other allies witch boosted the economy and materials to improve technology and use it.

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