Question 6

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waecmaths question: 

Express the square root of 0.000144 in the standard form

Option A: 

$1.2\times {{10}^{-4}}$

Option B: 

$1.2\times {{10}^{-3}}$

Option C: 

$1.2\times {{10}^{-2}}$

Option D: 

$1.2\times {{10}^{-1}}$

waecmaths solution: 

$\begin{align}  & 0.000144=1.44\times {{10}^{-4}} \\ & \sqrt{1.44\times {{10}^{-4}}}=\sqrt{{{(1.2)}^{2}}\times {{({{10}^{-2}})}^{2}}}=1.2\times {{10}^{-2}} \\\end{align}$

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