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density= mass/volume
Mass divided by Volume = Density. Or use the displacement method for an irregularly shaped object.
To determine the density of an irregular rock, you can use the water displacement method. First, measure the initial volume of water in a graduated cylinder. Then, submerge the rock completely in the water and measure the new water level; the difference in volume indicates the rock's volume. Finally, divide the mass of the rock (measured using a scale) by the volume obtained from the water displacement to calculate the density.
The answer will depend on what information is shown in the graph!
Object's density = (its mass) divided by (its volume)