Question

In 2017, there were about 21 million teenagers (aged 13-17) in the United States. They each

sent an average of 800 text messages per month. About how many text messages did all of the
teenagers in the United States send each month? Express your answer using scientific
notation. Show work for full credit.

Answer 1

The Number of text messages sent in a month is 1.68 ×
`10^((-8))`

Explanation:

Step 1 :

Total number of teenagers in United States = 21 million

Average text messages sent per month = 800

We need to find the number of text messages sent each month

Step 2 :

The number of text messages in a month can be computed by taking the product of the total number of teenagers and average messages sent per month

Therefore

Number of text messages that is sent in a month = 21 million × 800

= 21 ×
`10^(6)` × 800

= 168 ×
`10^(6)` = 1.68 ×
`10^((-8))`

Step 3 :

Answer :

The Number of text messages that is sent in a month is 1.68 ×
`10^((-8))`