(2x-) + (1/2xy-10) x=4 and y=7

Answer for 10 points show work you guys in advanced < 3

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.

Which answer choice is it? is it the first ,second,third or fourth giving 40 points for whoever answers correctly you