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JAMB Mathematics 1997 Question 3

Question 3

Fractions, Decimals and Approximation

Find the value of (0.006)3 + (0.004)3 in standard form.

  1. A.2.8 × 10−9
  2. B.2.8 × 10−8
  3. C.2.8 × 10−7
  4. D.2.8 × 10−4
Show the answer and explanation

Answer: C (2.8 × 10−7)

Explanation

0.006³ = 2.16 × 10⁻⁷ and 0.004³ = 0.64 × 10⁻⁷. Adding gives 2.8 × 10⁻⁷.