What is log base 10 of 0.1?

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Multiple Choice

What is log base 10 of 0.1?

Explanation:
Logarithms tell you what power the base must be raised to in order to get a given number. For base 10, log10(x) is the exponent y such that 10^y = x. The number 0.1 is the same as 1/10, which equals 10^-1. So log10(0.1) equals -1. The other possibilities would require 10^0 = 1, 10^1 = 10, or 10^2 = 100, none of which give 0.1, so they aren’t correct.

Logarithms tell you what power the base must be raised to in order to get a given number. For base 10, log10(x) is the exponent y such that 10^y = x. The number 0.1 is the same as 1/10, which equals 10^-1. So log10(0.1) equals -1. The other possibilities would require 10^0 = 1, 10^1 = 10, or 10^2 = 100, none of which give 0.1, so they aren’t correct.

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