Iwant the answers, plus i have to show work

Two lines parallel to the same plane are parallel to eachother

Which is a true statement about an exterior angle of a triangle a. it is formed by two segments that are not sides of the triangle, b. it forms a linear pair with one of the interior angles of the triangle, c. it is complementary to one of the interior angles of the triangle. d. it is formed by two segments that are sides of the triangle.

Y+ 2/y is it a polynomial in one variable or not? and if so, why?