A. The polynomilas x4+3x2+8 has 4 as the highest exponent hence its degree is 4.
B. The polynomilas x2+6x3+3 has 3 as the highest exponent of x hence its degree is 3.
C. The polynomilas1+x+x2+…+x30 has 30 as the highest exponent of x hence its degree is 30.