waecmaths question:
Simplify $(0.3\times {{10}^{5}})\div (0.4\times {{10}^{7}})$ leaving your answer in the standard form
Option A:
$7.5\times {{10}^{-4}}$
Option B:
$7.5\times {{10}^{-3}}$
Option C:
$7.5\times {{10}^{-2}}$
Option D:
$7.5\times {{10}^{-1}}$
waecmaths solution:
$\begin{align} & (0.3\times {{10}^{5}})\div (0.4\times {{10}^{7}})=\frac{0.3\times {{10}^{5}}}{0.4\times {{10}^{7}}} \\ & =0.75\times {{10}^{-2}} \\ & =7.5\times {{10}^{-3}} \end{align}$
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