Question:If `1.125 xx 10^k = 0.001125`, then the value of k is : 

A `-4` 
B `-3` 
C `-2` 
D `-1` 

+ Answer
B 

+ Explanation
`10^k = 0.001125/1.125`

`= 1.125/1125`

`= (1.125 xx 10^3)/(11125 xx 10^3)`

`= 1/10^3`

`= 10^-3`

:. k `= -3`.

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Irin Moni

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