verkwann7077 verkwann7077 25-01-2024 Mathematics contestada What is the numerical value of (2.1 × 10⁴)(4.0 × 10⁻²)? A. 8.4 × 10⁻⁸ B. None of these C. 8.4 D. 8.4 × 10⁻² E. 8.4 × 10²