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Answer :

  • First simplify with significant figures

[tex]\\ \rm\hookrightarrow 21000800[/tex]

[tex]\\ \rm\hookrightarrow 210008\times 10^2[/tex]

[tex]\\ \rm\hookrightarrow 21007\times 10^3[/tex]

[tex]\\ \rm\hookrightarrow 2106\times 10^4[/tex]

[tex]\\ \rm\hookrightarrow 215\times 10^5[/tex]

[tex]\\ \rm\hookrightarrow 2.1\times 10^7[/tex]

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