13.
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If log10 7 = a, then log10
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1
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is equal to:
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70
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A.
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- (1 + a)
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B.
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(1 + a)-1
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C.
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D.
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Answer: Option A
Explanation:
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= log10 1 - log10 70
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= - log10 (7 x 10)
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= - (log10 7 + log10 10)
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= - (a + 1).
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Title : Logarithms Q13
Description : 13. If log 10 7 = a , then log 10 1 is equal to: 70 A. - (1 + a ) B. (1 + a ) -1 C. a 10 D. ...
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