Which of the following expressions represents the sum of \(3.8\times 10^5\) and \(6.4\times 10^4\) in scientific notation?

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$$ 3.8\times 10^5 + 6.4\times 10^4 $$ $$ =38 \times 10^4 + 6.4\times 10^4 $$ $$ =(38+6.4)\times 10^4 $$ $$ =44.4 \times 10^4 $$ $$ =\boxed{4.44\times 10^5} $$

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