Answer:
![3,150](https://img.qammunity.org/2020/formulas/physics/middle-school/u5qunnxlwqnewzl0n65bj0fjpfnpecg32d.png)
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,
![3.15 * 10^3](https://img.qammunity.org/2020/formulas/physics/middle-school/yt8dh4tx2p1lqkf5s67y61ljnbg3pt9i2u.png)
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