In south america, five main indicate the majority ethnic groups and the main economic activities.

The answer is five main cultural regions. These five regions are the following:

1.       Tropical Plantation – this found in the north and east coast of South America.

2.       Rural Amerindian Region – Ecuador, Peru and Bolivia are the countries included here.

3.       Amazon Basin – This is the home to isolated Amerindian groups.

4.       Mixed Mestizo Region – this included the coastal area of the west and the interior highlands of the north and east.

5.       European Commercial Region – Also known as the southern cone. This includes Chile, Uruguay, Chile, and some parts of Brazil.

These five regions provide a basic understanding of the whole South American Continent. 

7.03-1.70=5.33 and 6.80+5.09=11.89 and 5.5-3.01=2.49