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WAEC Mathematics 2019 Question 2

Question 2

Indices

Evaluate: (0.064)−1/3

  1. A.5/2
  2. B.2/5
  3. C.−2/5
  4. D.−5/2
Show the answer and explanation

Answer: A (5/2)

Explanation

0.064 = 64/1000, whose cube root is 4/10 = 2/5. The negative power turns it upside down: 5/2.