Eighth grade \( > \) D. 5 Multiply numbers written in scientific notation yzU Multiply. \[ \left(4 \times 10^{8}\right)\left(2 \times 10^{1}\right) \]

To multiply the numbers in scientific notation, you first multiply the coefficients (the numbers in front) and then add the exponents of the base 10. So, for \((4 \times 10^{8})\) and \((2 \times 10^{1})\): 1. Multiply the coefficients: \[4 \times 2 = 8\] 2. Add the exponents: \[8 + 1 = 9\] Putting it all together, you get: \[8 \times 10^{9}\] So, \(\left(4 \times 10^{8}\right)\left(2 \times 10^{1}\right) = 8 \times 10^{9}\).