a) x^3 * x^5 * x = x^(3+5+1) = x^9
b) x^20 * x^14 = x^(20+14) = x^34
c) (x^8)^3 * x^16 = x^(8*3) * x^16 = x^(24+16) = x^40
d) x^0 * x^5 * (x^2)^2 = 1 * x^5 * x^(2*2) = x^(5+4) = x^9
e) (x^6)^3 / (x^3)^5 = x^(6*3) / x^(3*5) = x^18 / x^15 = x^(18-15) = x^3
f) x^12 * x^7 / (x^4)^3 = x^(12+7) / x^(4*3) = x^19 / x^12 = x^(19-12) = x^7