WAEC Mathematics 2000 Question 6

Question 6

Indices

Simplify (16/81)−3/4 × √(100/81)

  1. A.80/243
  2. B.1/64
  3. C.25/6
  4. D.15/4
Show the answer and explanation

Answer: D (15/4)

Explanation

(16/81)−3/4 = (81/16)3/4 = (3/2)3 = 27/8, and √(100/81) = 10/9. 27/8 × 10/9 = 15/4.