a)(3x3y2)2y3 = 6x3y5
b)(5w2z-2)2(z3) = 25w4z-4z3 = 25w4z-1 = 25w4/z
a) y2y-5 = y-3
b) z5z-3z-4 = z-2
c) y7y0÷(y10) = y-3