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 10^3/1125 xx 10^3 = 1/10^3 = 10^-3`. 
:. k=-3.

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Jahangir Alam

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