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WAEC Further Mathematics 2017 Question 12

Question 12

Matrices and Determinants

If (2 1 / 4 3)(5 / 4) = k(17.5 / 40.0), find the value of k. (Matrices written row by row; / separates the rows.)

  1. A.0.20
  2. B.0.40
  3. C.0.80
  4. D.1.25
Show the answer and explanation

Answer: C (0.80)

Explanation

The product is (14 / 32), and (14 / 32) = 0.8 × (17.5 / 40), so k = 0.80.