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In 1980, the United States' national debt exceeded $9 billion dollars. Express the exact dollar amount in scientific notation.
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In 1980, the United States' national debt exceeded $9 billion dollars. Express the exact dollar amount in scientific notation.

User Piyush Kashyap
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9 billion = 9,000,000,000 = 9.0 x 10^9
User Mklhmnn
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