Final answer:
To find the volume of the irregular solid, subtract the initial water volume (43mL) from the final water level (56mL), which results in a solid volume of 13mL.
Step-by-step explanation:
The volume of the solid can be determined by the displacement of the water in the graduated cylinder. Initially, the cylinder contained 43mL of water, and after placing the solid in it, the water level rose to 56mL. To find the volume of the solid, subtract the initial water volume from the final volume:
Volume of solid = Final water level - Initial water level
Volume of solid = 56mL - 43mL
Volume of solid = 13mL
Therefore, the volume of the irregular solid is 13mL.