If $${\log _{10}}7 = a,$$ then $${\log _{10}}\left( {\frac{1}{{70}}} \right)$$ is equal to - Options: A . &nbsp-(1 + a) B . &nbsp(1 + a)-1 C . &nbsp$$\frac{a}{{10}}$$ D . &nbsp$$\frac{1}{{10a}}$$

If $${\log _{10}}7 = a,$$ then $${\log _{10}}\left( {\frac{1}{{70}}} \right)$

Question

If $${\log _{10}}7 = a,$$ then $${\log _{10}}\left( {\frac{1}{{70}}} \right)$$ is equal to -

Options:

A . -(1 + a)

B . (1 + a)-1

C . $$\frac{a}{{10}}$$

D . $$\frac{1}{{10a}}$$

Answer: Option A

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