#### Answer

$3.1536 \times 10^{7}$

#### Work Step by Step

1. 365 days $\times$ 24 hours per day = 8760 hours
2. 8760 hours $\times$ 60 minutes per hour = 525,600 minutes
3. 525,600 minutes $\times$ 60 seconds per minute = 31,536,000 seconds
Therefore, there are 31,536,000 seconds in one year.
To put this answer in scientific notation:
1. Put the decimal point after the first digit: 3.1536000
2. Count how many decimal places we moved from the right. In this case, that would be seven. Raise 10 to that power: $10^{7}$
3. Drop the final 0s on the decimal portion and multiply it by the exponent portion: $3.1536 \times 10^{7}$