Answer:
Psychological Warfare
Explanation:
The Mongols wanted people to believe that they were scarier and more violent than they actually were because that would deter them from fighting against them. Whenever the Mongols went to go take a piece of land, people often surrendered the land to them without fighting because they were scared (this didn't always happen.)
D. appeal directly to voters for support.
Copernicus said that it was the Sun that was the center of the Solar System, not Earth
Answer:
It gave the Union army control of the Mississippi River

The formula is above, so if you plug it in it should be 34 squared times 27.
24 squared is 1156. Multiply 1156 by 27 and you have 31212. If you have to solve it with 3.14, just multiply that by 3.14 (Would take too long for me).