Question 1

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waecmaths question: 

Evaluate (0.13)3 correct to three significant figures.

Option A: 

0.00219

Option B: 

0.00220

Option C: 

0.00300

Option D: 

0.00390

waecmaths solution: 

$\begin{align}  & {{0.13}^{3}}=0.13\times 0.13\times 0.13 \\ & {{0.13}^{3}}=1.3\times {{10}^{-1}}\times 1.3\times {{10}^{-1}}\times 1.3\times {{10}^{-1}} \\ & {{0.13}^{3}}=2.197\times {{10}^{-3}} \\ & {{0.13}^{3}}=0.002197 \\ & 0.13\approx 0.00220\text{ to 3s}\text{.f} \\\end{align}$

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