On this problem you don't need to subtract. They want to know the total amount of people who attended so you would add.
1 1 1 (carried over numbers)
12,679 (Line it up with 8491, ones place to ones place and so on)
+8,491
21170 (answer)
Answer:
Una estructura de gobierno donde un dictador tiene el control total de todo el país, estado o territorio
Answer:
I believe the answer is C
They were two of the richest, most powerful men in America during the Gilded Age.