Inverse of a function help?
For security, a credit card number is coded in the following way, so that it can be sent as a message. "Subtract each digit from 9."
a) Code the credit card number 3201 2342 3458 0931.
b) A coded credit card number is 2341 0135 7923 0133. What is the original credit card number?
c) Find f(x) if x represents a single input digit. What is the domain of f(x)?
c) Find f^-1(x). What is the domain of f^-1(x)?
Note: I have found the answers for both a) and b) already. I just need help with c) and d)...I provided all information given to help.

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