(i) The highest degree of x2+x is 2, so it is a quadratic polynomials.
(ii) The highest degree of x−x3 is 3, so it is a cubic polynomials.
(iii)The highest degree of y+y2+4 is 2, so it is a quadratic polynomials.
(iv) The highest degree of x in (1+x) is 1, so it is a linear polynomials.
(v)The highest degree of t in 3t is 1, so it is a linear polynomials.
(vi)The highest degree of r2 is 2, so it is a quadratic polynomials
(vii)The highest degree of x in 7x3 is 3, so it is a cubic polynomials.