What impact did the Doolittle Raiders have at the start of World War II? 1)They energized American forces by launching air attacks on Tokyo.
2)They saved the crews of several ships that were bombed in Pearl Harbor.
3)They proved African American pilots were as skilled as white pilots.
4)they collected rationed goods to send to the troops in Europe.

a is the answer

Explanation:

i belive the continental association was created to boycott all contact with british goods.

i also belive it was in december 1, 1774

simplify brackets

8 - 2a - 7 = a + 40

simplify 8 - 2a - 7 to -2a + 1

-2a + 1 = a + 40

add 2a to both sides

1 = a + 40 + 2a

simplify a + 40 + 2a to 3a + 40

1 = 3a + 40

subtract 40 from both sides

1 - 40 = 3a

simplify 1 - 40 o -39

-39 = 3a

divide both sides by 3

-39/3 = a

simplify 39/3 to 13

-13 = a

switch sides

a = -13