Answer
$3 \times 10^{3}$
Work Step by Step
Convert each number to scientific notation to find:
$=(5 \times 10^{-4})(6 \times 10^{6})$
Multiply the corresponding parts together to find:
$=(5 \cdot 6)\times (10^{-4} \cdot 10^{6})
\\=30 \times 10^{-4+6}
\\=30 \times 10^{2}
\\=3.0 \times 10^{2+1}
\\=3 \times 10^{3}$
