## Thinking Mathematically (6th Edition)

$6 \times 10^{-8}$
Convert each number to scientific notation to find: $=(1.5 \times 10^{-5})(4 \times 10^{-3})$ Multiply the corresponding parts together to find: $=(1.5 \cdot 4)\times (10^{-5} \cdot 10^{-3}) \\=6 \times 10^{-5+(-3)} \\=6 \times 10^{-8}$