A credit card number is coded so that it can be sent as a message by subtracting each digit from 9... Code the credit card number 3201 2342 3458 0931 Coded credit card number is 2341 0135 7923 0133....
A credit card number is coded so that it can be sent as a message by subtracting each digit from 9...
Code the credit card number 3201 2342 3458 0931
Coded credit card number is 2341 0135 7923 0133. What is the original credit card number?
Find f(x) if x represents a single input digit. What is the domain of f(x)?
Find `f^(-1)(x)` . What is the domain of `f^(-1)(x)` ?
- print Print
- list Cite
Expert Answers
calendarEducator since 2010
write12,544 answers
starTop subjects are Math, Science, and Business
The credit card number is coded by subtracting each digit of the number from 9.
To code the credit card number 3201 2342 3458 0931 subtract each of the digits from 9. This gives (9-3)(9-2)(9-0)(9-1)(9-2)(9-3)(9-4)(9-2)(9-3)(9-4)(9-5)(9-8)(9-0)(9-9)(9-3)(9-1)
=> 6798 7657 6541 9068
If a credit card number is coded as 2341 0135 7923 0133 the original number is (9-2)(9-3)(9-4)(9-1)(9-0)(9-1)(9-3)(9-5)(9-7)(9-9)(9-2)(9-3)(9-0)(9-1)(9-3)(9-3)
=> 7658 9864 2076 9866
If x represents a digit of the number, f(x) = 9 - x. The domain of f(x) is [0, 9]
`f^-1(x)` = 9 - x. The domain of `f^(-1)(x)` is [0, 9]
Related Questions
- Sum of digits of a two-digit number is 14. If 29 is subtracted from the number the digits of the...
- 1 Educator Answer
- find the domain of f(x) = 1/sqrt(x-3)
- 1 Educator Answer
- For the function f(x)=x^2-5 find the domain and range.
- 2 Educator Answers
- Find the inverse of f(x)=6x. What is the domain and range of f and f^-1.
- 1 Educator Answer
- `f(x) = x/(1 - ln(x - 1))` Differentiate f and find the domain of f.
- 1 Educator Answer
Unlock This Answer Now
Start your 48-hour free trial to unlock this answer and thousands more. Enjoy eNotes ad-free and cancel anytime.