What is the gcf of the numerator and denominator in the following fraction 21m^2n/ 28mn^2? a.) 7m^2n^2
b.) 7 mn
c.) 21 m^3n^3
d.) mn

This is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 5 terms.