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GCE Mathematics 1990 Question 7

Question 7

Logarithms

If log x = 2̄.3675 and log y = 0.9750, what is the value of x + y? Correct to three significant figures.

  1. A.1.18
  2. B.1.31
  3. C.9.03
  4. D.9.44
  5. E.9.46
Show the answer and explanation

Answer: E (9.46)

Explanation

x = antilog 2̄.3675 = 0.02331 and y = antilog 0.9750 = 9.441, so x + y = 9.464 ≈ 9.46.