In what way did the United States contribute to end world war 1 all that apply

-The peace treaty, authored by representatives of the United States, was signed by Austria-Hungary and Germany and immediately ended the war. ... -U.S. troops aided the Allied Powers on the battlefield. -U.S. citizens gave up food or gas to help in the war effort.Jun 21, 2017

Explanation:

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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

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