Final answer:
The density of the irregular solid cannot be determined with the information provided, as both the mass and volume are listed as unknown. The common unit for density in solids and liquids is g/cm³, and the precision of the answer should reflect the measured values' significant figures.
Step-by-step explanation:
The density of a substance is calculated as the mass divided by the volume. The given problem does not provide enough information to calculate the density of the given irregular solid, as the mass and volume are indicated as unknown. Therefore, we cannot select options a, b, c, or d without this information. When calculating density, it is important to use consistent units, and for solids and liquids, grams per cubic centimeter (g/cm³) is a common unit of measurement. Remember to pay attention to significant figures in the final answer, as this ensures that the precision of the result reflects the precision of the measurements.