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Mathematics 13 Online
OpenStudy (anonymous):

(4.2*10^2)(4.2*10^5)

OpenStudy (neo92):

\[10^{2}=100\text{ and } 10^{5}=100000\] can u do it now?

OpenStudy (neo92):

also this can be easily done by considering \[(4.2\times10^{2})^{2}\times10^{3}\]

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