In WordPad, you can highlight the exponent and format it as a SuperScript. In Excel, you use the ^ symbol to represent an exponent (Example: 4^2 means four to the second power, or four squared.)
You just change the number to a superscript. Highlight the 2, go to Font and check superscript. Now you have the power of 2. Just be sure to change the type back if you continue...
If you go to the Insert Menu and Symbol, under the Normal Text format, you will find it there if you slowly scroll down a bit. Another way is to superscript the 2. Type the 2 in and select it. Then...