To find out how many people live in all three countries altogether, we simply add the populations of the United States, Canada, and Mexico:
Population of the United States: 3.2 × 10^8
Population of Canada: 3.9 × 10^7
Population of Mexico: 1.1 × 10^8
Adding them together:
3.2 × 10^8 + 3.9 ×10^7 + 1.1 × 10^8
= (3.2 + 0.39 + 1.1) × 10^8
= 4.69 × 10^8
So, about 4.69 × 10^8 people live in all three countries altogether.
