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.

1. Code the credit card number 3201 2342 3458 0931.

2. A coded credit card number is 2341 0135 7923 0133. What is the original credit card number?

3. Find f(x) if x represents a single input digit. What is the domain
of f(x)?

4. Find f-1(x). What is the domain of f-1(x)?

Question

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. 

1. Code the credit card number 3201 2342 3458 0931. 

2. A coded credit card number is 2341 0135 7923 0133. What is the original credit card number? 

3. Find f(x) if x represents a single input digit. What is the domain 
of f(x)? 

4. Find f-1(x). What is the domain of f-1(x)?

anonymous · Answer

can someone help me out please?

anonymous · Answer

1. 6798 7657 6541 9068
2. 7658 9864 2076 9866
I'm sorry I'm no good at functions so I don't know the answers to the other two.