Answer:

Step-by-step explanation:
When converting scientific notation into standard notation, it is always important to keep in mind that when 10 has a positive exponent, you move the decimal point to the right. Then if 10 has a negative exponent, you move the decimal point to the left.
So we see,

Since 10 has a positive exponent, we move the decimal point to the right.
10 to the power of 3 (Move decimal point to the right three times!)
3.15
31.5
315.
3,150