log 10 4 + log 10 5 - log 10 2
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that is the best answer
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Step-by-step explanation:
= log10(4) +log10(5)-log10(2)
= log10(4×5) - log10(2) (Rule: logA + logB = logA×B)
= log10(20)-log10(2)
= log10(20÷2) (Rule: logA - logB = logA÷B)
= log10(10) ( logX(X) = 1 for all x )
= 1
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