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WAEC Mathematics 2000 Question 11

Question 11

Logarithms

Given that the logarithm of a number is 1̄.8732, find, correct to 2 significant figures, the square root of the number.

  1. A.0.29
  2. B.0.75
  3. C.0.86
  4. D.0.93
Show the answer and explanation

Answer: C (0.86)

Explanation

The number is antilog 1̄.8732 = 0.747. Its square root is about 0.864 ≈ 0.86 (or halve the log: 1̄.9366 gives 0.864).