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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