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B) 3*(1/3)⁴ = (1/3)³ = 1/27
C) 2*(1/3)⁻² = 2*1/(1/3)² = 2*1/(1/9) = 2*9 = 18
D) log40 - 3log2 = log40 - log2³ = log40 - log8 = log(40/8) = log5