Question:If`log_10 2 = 0.3010,` the value of `log_10 25` is : 

A `1.5050` 
B `1.3980` 
C `1.2040` 
D `0.6020` 

+ Answer
B 

+ Explanation
`log_10 25`

`= log_10 (100/4)`

`= log_10 100 - log_10 4`

`= 2 - 2 log_10 2`

`= (2 - 2 xx 0.3010)`

`= (2 - 0.6020)`

`= 1.3980.`

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Irin Moni

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