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.