Answer :
Answer:
She has lived [tex]5.68021248\times 10^8\ \text{seconds}[/tex].
Step-by-step explanation:
Given : Sara has lived 18.0 years.
To find : How many seconds has she lived?
Solution :
Using conversions,
1 year = 365.24 days
1 day = 24 hours
1 hour = 60 minutes
1 minute = 60 seconds
Converting 18 years into seconds,
[tex]18 \text{years} = 18\times 365.24\times 24\times 60\times 60\ \text{seconds}[/tex]
[tex]18 \text{years} =568021248\ \text{seconds}[/tex]
In scientific notation,
[tex]18 \text{years} =5.68021248\times 10^8\ \text{seconds}[/tex]
Therefore, she has lived [tex]5.68021248\times 10^8\ \text{seconds}[/tex].