Recall the formula for the volume of a cube of side L as:
Therefore, the volume of the cube in our case is:
![\text{Volume}=(5.3\operatorname{cm})^3=148.877\operatorname{cm}^3]()
If they ask you to round the answer to a certain number of decimals, please let me know. otherwise this is your EXACT answer with no rounding.
Are you trying to find the density of the cube?
If the mass of the cube is 280 grams, then you need to divide the mass by the volume we just found as shown below:
density of the cube = mass / volume = 280 / 148.877 g/cm^3 = 1.88 g/cm^3