\eqalign{ & {\text{If}}\,\,{\log _{10}}7 = a,{\text{then}}\,\,{\log _{ – McqOptions

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1.	\eqalign{ & {\text{If}}\,\,{\log _{10}}7 = a,{\text{then}}\,\,{\log _{10}}\left( {\frac{1}{{70}}} \right)\,\, \cr & {\text{is}}\,\,{\text{equal}}\,\,{\text{to}} - \cr} $$?
A.	-(1 + a)
B.	(1 + a)-1
C.	a/10
D.	1/10a
Answer» B. (1 + a)-1

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