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Answer: The answer is 185 Pm
Density is mass over volume. If you put it into a formula it would look like this:

Based on the problem given, you can see that the mass of the aluminum block is 82.0 g and the volume is 12.8 cm3. Just put that into your equation and solve for it:
The answer is then letter C.
Centrifugation is usually use to separate different components of blood.