Final answer:
A graduated cylinder and balance are the correct set of equipment to determine the density of an unknown liquid.
Step-by-step explanation:
The correct set of equipment that can be used to determine the density of an unknown liquid is a graduated cylinder and balance.
A graduated cylinder is used to measure the volume of the liquid accurately, while a balance is used to measure the mass of the liquid. By dividing the mass by the volume, you can calculate the density of the unknown liquid.