To express 2.8 billion miles in scientific notation, we first recognize that 1 billion is equal to \(10^9\). Therefore, 2.8 billion can be expressed as:
\[ 2.8 \times 10^9 \]
Thus, 2.8 billion miles in scientific notation is:
\[ 2.8 \times 10^9 \text{ miles} \]
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