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JAMB Mathematics 1979 Question 33

Question 33

Logarithms

Find the value of log10 (1/40), given that log10 4 = 0.6021

  1. A.1.3979
  2. B.2̄.3979
  3. C.16021
  4. D.1.6021
  5. E.2.6021.
Show the answer and explanation

Answer: B (2̄.3979)

Explanation

log(1/40) = −(log 4 + log 10) = −1.6021, which in bar notation is 2̄.3979 (−2 + 0.3979).