The correct answers are:
1. True;
The bartering is way of trade where there's exchanging of goods without using money, and it represents the oldest way of trade performed by the humans.
2. True;
Hernan Cortes was the leader of the Spanish army in modern day Mexico, and he managed to defeat the Aztecs, thus putting their territory under the rule of the King of Castille.
3. True;
Conquistadors is a term used for the Spanish conquerors in Central and South America in the 16th century. They were sent to conquer and find treasures, and that's what they did in the name of the King of Castille.
4. True;
Tenochtitlan was a very big city-state, and it was the capital of the Aztec Empire. It was located on the marshy parts of the Lake Texcoco, in the Valey of Mexico, where in the present is located the Mexican capital, Mexico City.