As a result of the adams-onis treaty, a.) the US extended its border b.) spain gained control of florida c.) britain gave texas to the united states d.) spain gained control of the oregon country

The correct answer is A.) the United States extended its border.

Explanation:

I just finished doing the test on edge 2020 and got it right. :P

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

i think its 5! hope i