Density is mass divided by volume. If you have any two, you have the third. 40 grams in 10 cubic centimeters is 4 g/cm³. Volume formulas are in area and volume.
Match the unit
Convert first if mass is in kilograms and volume is in milliliters, in unit conversion. A cube's volume is the side cubed, in volume of a cube.
The short list is in ACT Math formulas.
The bottom line
D = m / V. Convert units before you divide.
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