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13. 2a^2b X 4ab= 8a^3b^2 C
14. (3x)^3/9x^3=27x^3/9x^3=3 A
15. a-2/3 + 4-a/5 = 5a-10+12-3a/15=2a+2/15=2(a+1)/15 A