#### Answer

$$3.8 \times 10^{-6}=0.0000038$$

#### Work Step by Step

$$3.8 \times 10^{-6}$$
Recall that scientific notation is expressed in the form:
$$a\times10^{n}$$
To convert from scientific notation to decimal notation, move the decimal point $n$ places to the right if $n$ is positive. If $n$ is negative, move the decimal point in a to the left $|n|$ places.
Since $n=-6$ is negative, the decimal point should be moved $6$ places to the left.
The resulting value is:
$$0.0000038$$