How do you divide $\frac{0.8 \times 10^{- 7}}{4 \times 10^{- 4}}$ $\frac { 0.8\times 10^ { - 7} } { 4\times 10^ { - 4} }$ ?

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Answer 1 · 2017-08-31T08:56:41

$2 \cdot 10^{- 4}$ $2 * 10^-4$

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Answer 2 · 2017-08-31T14:06:16

$2 \times 10^{- 4}$ $2xx10^(-4)$

$\frac{0.8 \times 10^{- 7}}{4 \times 10^{- 4}}$ $(color(red)(0.8xx10^(-7)))/(color(green)(4xx10^(-4)))$

This is the same as $\frac{0.8 \times 10^{4}}{4 \times 10^{7}}$ $color(red)((0.8color(green)(xx10^4))/(color(green)(4)xx10^7))$

Which is also the same as $\frac{8 \times 10^{3}}{4 \times 10^{7}}$ $(8xx10^3)/(4xx10^7)$

This is the same as $2 \times 10^{3 - 7} = 2 \times 10^{- 4}$ $2xx10^(3-7)" "=" "2xx10^(-4)$

How do you divide 0.8×10−74×10−4\frac { 0.8\times 10^ { - 7} } { 4\times 10^ { - 4} }?