Final answer:
To express 3^4m^-1 in terms of c and/or y, the expression is c^4y^(-1).
Step-by-step explanation:
To express 3^4m^-1 in terms of c and/or y, we can first rewrite 3^4m^-1 as (3^4)^m^-1. Since x = 3^m, we can substitute x^4 for (3^4). Similarly, since y = 3^n, we can substitute y^(-1) for m^(-1). Therefore, 3^4m^-1 can be expressed as (x^4)^(y^(-1)), or simply x^4y^(-1). So the expression in terms of c and/or y is c^4y^(-1).