WAEC Mathematics 2019 Question 18

Question 18

Indices

If (0.25)y = 32, find the value of y.

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

Answer: A (y = −5/2)

Explanation

0.25 = 2−2 and 32 = 25, so −2y = 5 and y = −5/2.