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Serhud [2]
3 years ago
5

Will Mark Brainliest 

Mathematics
1 answer:
Klio2033 [76]3 years ago
7 0

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.

<h3><u>Error</u>: When we move decimal one place on left the exponent of 10 should be raised to one.</h3><h3><u>Correct work</u>: After moving decimal one place on we would get left 1.035 x 10^11.</h3><h3><u>Strategy used</u>: Moving decimal one place left raise the power 10 to one and moving decimal place right decrease the power 10.</h3>
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