The correct answer to this question is 10^10. This type of question would be primarily found on a math test. Inverse functions have one to one. Therefore, if a is the inverse of b, then b is the inverse of a. Being that they are inverses of each other, they are also one to one functions.
The domains and range are also equal to each other. Therefore, a is the domain equal to b, and then a range is equal to the range of b. As shown in the illustration provided, inverse fractions can be graphed to understand them further.