Express $0.0084$ in scientific notation.

84 \times 10^{- 4}

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8.4 \times 10^{- 3}

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0.84 \times 10^{- 2}

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None of the above

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Solution

The correct option is B $8.4 \times 10^{- 3}$
$0.0084 = \frac{84}{1000} = \frac{84}{10^{3}} = 8.4 \times 10^{- 3}$

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