Finding Density - Liquid Displacement 011

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A metal object was found to have a mass of 18.7863 g. The object was inserted into a graduated cylinder containing 3.75 mL of water. The new volume reading was 5.89 mL.

a) Calculate the density of the metal object to the correct number of significant figures.
b) Which measurement (mass or volume) limits the number of significant figures?
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Honestly it sounds like no one is listening, but I came here for some explanation of sig figs. Thanks!

jonbassinger-flores