If you are to write scientific notation use the ^ (shift+6 on the keyboard) symbol.
Do not use spaces
Example
5.20x10^0
-5.20x10^-5
Integer problems are indicated by (integer). Integer problems answers must be exact, no plus or minus one digit, no decimal point or scientific notation.
Dollar sign ($) problems should be answered to the exact cent, but plus or minus one cent error is permitted. The decimal point and cents are required for exact dollar answers.