Answer
$\color{blue}{2.09 \times 10^4}$
Work Step by Step
Multiply the corresponding parts (multiply the constants together and the powers of 10 together) to obtain:
$=(3.8 \times 5.5) \times (10^4 \times 10^{-1})
\\=20.9 \times 10^{4+(-1)}
\\=20.9 \times 10^3$
Write $20.9$ as $2.09 \cdot 10^1$ to obtain:
$=(2.09\cdot 10^1) \times 10^3
\\=2.09 \times 10^{3+1}
\\=\color{blue}{2.09 \times 10^4}$