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If log10 7 = a, then log10 ❨ 1 ❩ is equal to: 70

Correct Answer: - (1 + a)

Explanation:

log10 1
70
= log10 1 - log10 70
= - log10 (7 x 10)
= - (log10 7 + log10 10)
= - (a + 1).

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