Will mark brainliest  1) identify and explain the error 2)show correct work and solution 3)what strategy did you use for solving this problem?

US postal service delivered = 7.14 x 10^10 pieces of mail in December.

US postal service delivered = 3.21 x 10^10 pieces of mail in January.

We need to find the total number of mail delivered in both months.

In the shown work you setup problem correctly.

You are adding

7.14 x 10^10

3.21 x 10^10

10.35 x10^10

You got 10.35 x10^10 on adding.

Therefore, second step is correct too.

But in third step when you moved decimal one place on left you wrote 1.035 x 10^10.

1. 3

2. 4

3. 1

hope this ! have a great day.

-wfz