Step-by-step solution: Convert the numbers to scientific notation: 0.04=4×10−2,0.0162=1.62×10−2,0.001=1×10−30.04 = 4 \times 10^{-2}, \quad 0.0162 = 1.62 \times 10^{-2}, \quad 0.001 = 1 \times 10^{-3}0.04=4×10−2,0.0162=1.62×10−2,0.001=1×10−3 Multiply the numbers: 4×1.62=6.484 \times 1.62 = 6.484×1.62=6.48 Multiply the powers of 10: 10−2×10−2×10−3=10−710^{-2} \times 10^{-2} \times 10^{-3} = 10^{-7}10−2×10−2×10−3=10−7 Combine the results: 6.48×10−7=0.0000006486.48 \times 10^{-7} = 0.0000006486.48×10−7=0.000000648 Thus, the correct answer is 0.000000648.