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The expression "4.5 x 10^9" is written in scientific notation, where "4.5" is the coefficient and "10^9" indicates that the decimal point in 4.5 should be moved 9 places to the right. This means that "4.5 x 10^9" is equal to 4,500,000,000. In standard form, it represents the number four billion five hundred million.

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4w ago

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