Linear polynomial, quadratic polynomial, and cubic polynomial has its degrees as 1, 2, and 3 respectively.

(i) x^{2 }+x is a quadratic polynomial as its degree is 2.

(ii) x - x^{3} is a cubic polynomial as its degree is 3.

(iii) y + y^{2} +4 is a quadratic polynomial as its degree is 2.

(iv) 1 + x is a linear polynomial as its degree is 1.

(v) 3t is a linear polynomial as its degree is 1.

(vi) r^{2} is a quadratic polynomial as its degree is 2.

(vii) 7x^{3} is a cubic polynomial as its degree is 3.