Question:If `log_10 (0.1) = -1,`then`log_10 (.001)` is : 

A `- 1.3` 
B `- 2` 
C `- 2.3` 
D `-3` 

+ Answer
D 

+ Explanation
`log_10 (.001)`

`= log_10 (.1/100)`

`= log_10 (.1) - log_10 (100)`

`= (- 1 - 2)`

`= -3.`

+ Report

Irin Moni

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