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09-02-2024
Mathematics

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What is the numerical value of (2.1 x 10⁴)(4.0 x 10⁻²)?
1) 8.4 x 10⁻²
2) 8.4 x 10²
3) 8.4
4) 8.4 x 10⁻⁸
5) none of the above

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