Which pair of terms is a pair of like terms? a. g^2h and gh^2 b.3g and 3h c. g^4 and h^4 d.4g^2 and 9g^2

Two terms are said to be like terms if they involve the same powers of the same variables.

So:

and are not like terms, because they involve the same variables, but with different exponents. and are not like terms, because they don't involve the same variables. and are not like terms, because they involve the same powers, but of different variables. and are like terms, because they involve the same power (the square) of the same variable ()