#12.
Input Output
1. b bc
2. d dc
3. e ec
4. g^2 cg^2
5. mn cmn
6. x xc
7. c c^2
8. 0 0
9. 1 c
The rule is multiplying by c.
13. a. An example rule would be x•2+1
(x is the input number)
b. There are infinitely many solutions because there are infinite amount of numbers that can be used.