#### Answer

$8.09 \times 10^{-3}$

#### Work Step by Step

RECALL:
In the scientific notation $a \times 10^{n}$, $1 \le a \lt 10$ and $n$ is an integer.
Move the decimal point 3 places to the right to obtain $8.09$.
To retain the value of the given number, multiply $10^{-3}$ to $8.09$.
Thus, the scientific notation of the given number is:
$=8.09 \times 10^{-3}$