I. Determine the degree of each polynomial equation 21. (x + 4)*(x + 5) 22. x-8 23. (x + 1)(2x + 4)(x - 3)(x-8) 24. (x - 2)(2x + 4)*(x + 3) 25. x(x + 1)(2x + 4)2+(x - 8)​