Question

About `3. 2 x 10^{8}` people live in the United States.

About `3. 9 x 10^{7}` people live in Canada.




And about `1. 1 x 10^{8}` people live in Mexico.






About how many people live in all three countries altogether?

Answer 1

About 4.69 x 10^8 people live in all three countries altogether

Explanation:

3.9 x 10^7 is .39 x 10^8

now you can make x 10^8 into y

3.2y + .39y + 1.1y =

4.69y

make y into x 10^8 again

4.69 x 10^8