log(base x) 10^-2=-2
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Good question...
Step-by-step explanation:
log102=0.30103 (approx.) The base-10 logarithm of 2 is the number x such that 10x=2 . You can calculate logarithms by hand using just multiplication (and dividing by powers of 10 - which is just digit shifting) and the fact that log10(x10)=10⋅log10x , though it's not very practical...
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