In the 1800s, the term "Native American" was used to describe: A. Runaway slaves who lived among tribes.
B. White Catholics.
C. White Protestants.
D. Immigrants who lived among tribes.

I think it is D. Immigrants who lived among tribes.

Explanation:

indigenous group of people in the western hemisphere, such as North America. Hope that helps

I believe it would be either B or C.

Explanation:

The question tricked me a little bit because native American were indigenous people in America in the 18th century, but I don't see any answer like this. Unlike the person that answered above I don't think it's D. because it says "immigrants" meaning they came from other country, the country they were born and it was not America, so they are NOT native in answer D.

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