SOMEONE PLEASE HELP ME I WILL GIVE U BRAINLIEST!!!

Ihave trouble finding the nth term of a linear sequence

Can someone me with the property questions for 12 13 and 14 plz

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.