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WAEC Mathematics 1994 Question 7

Question 7

Logarithms

What is the number whose logarithm to base 10 is 3̄.4771?

  1. A.3.0
  2. B.0.3
  3. C.0.03
  4. D.0.003
  5. E.0.0003
Show the answer and explanation

Answer: D (0.003)

Explanation

The mantissa 0.4771 is log 3, and the characteristic bar 3 (that is, −3) puts the first significant figure in the third decimal place, so the number is 0.003.