{\rm{If}}{\kern 1pt} \,{\kern 1pt} {\log _{10}}7 = a,{\kern 1pt} {\ker – McqOptions

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1.	{\rm{If}}{\kern 1pt} \,{\kern 1pt} {\log _{10}}7 = a,{\kern 1pt} {\kern 1pt} {\rm{then}}\,{\kern 1pt} {\kern 1pt} {\log _{10}}\left( {{1 \over {70}}} \right){\rm{is}}\,{\kern 1pt} {\rm{equal}}\,{\kern 1pt} {\rm{to}}$$
A.	- (1 + a)
B.	(1 + a)-1
C.	a/10
D.	1/10a
Answer» B. (1 + a)-1

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