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Mathematics, 24.11.2019 01:31 hernsl0263

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)?

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