Evaluate \(3.0\times 10^1 – 2.8\times 10^{-1}\)leaving the answer in standard form

Mathematics WAEC 1998

Evaluate \(3.0\times 10^1 – 2.8\times 10^{-1}\)leaving the answer in standard form

  • \(2\times 10^{-1}\)
  • \(2\times 10^{2}\)
  • \(2.972 \times 10^{1}\) checkmark
  • \(2.972 \times 10^{2}\)

The correct answer is: C

Explanation

\(3.0\times 10^1 - 2.8\times 10^{-1}\) = 30 - 0.28 = 29.72 = 2.972 x 10\(^1\) 

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