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a) 2log16 = 2log2^4 =4
b) 3 log 1/81 = 3log 81^-1 = 3log 3^-4 = -4
c) 3log5 5log 2 2log27 = 3log27 = 3log 3^2 = 2
d) 2log2^3 -3log3^2 + 5Log^5-2 = 3 - 2 -2 = -1