Which expression have an value of 36

The depth of a lake at a certain point, wich is a function of the distance of that point from shore, is 30 feet.

    choose the correct definition for  extremo.  a.  end      b.  extra      c.  extract      d.  eventual 

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.