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[tex] \frac{6.9 \times {10}^{8} }{3 \times {10}^{5} } = \frac{69 \times {10}^{ - 1} \times {10}^{8} }{ 3 \times {10}^{5} } = \\ [/tex]
[tex] \frac{69}{3} \times {10}^{8 - 1} \times {10}^{ - 5} = \\ [/tex]
[tex] 23 \times {10}^{7} \times {10}^{ - 5} = [/tex]
[tex]23 \times {10}^{7 - 5} = [/tex]
[tex]23 \times {10}^{2} = [/tex]
[tex]2.3 \times {10}^{3} [/tex]
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Thus the correct answer is the first one.
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