Answer
$$2.13\times 10^{-3}.$$
Work Step by Step
We multiply and divide the two numbers as follows:
$$\frac{(3500)(0.00164)}{2700}=\frac{(3.5\times 10^3)(1.64\times 10^{-3})}{2.7\times 10^3}
\\
=2.1259 \times 10^{-3}=2.13\times 10^{-3}.$$
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