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