The volume of a cube is given by this formula:
V = a^3
where a will be the side
Since the cube has all the sides being equal in length, we only need to raise it to the power of 3, therefore
V = 20^3
V = 8000, since we are talking about milliliters that will be 8000 mL
Part B
This part we only need to convert mL to L, which we can do by dividing 8000 by 1000, which will give us 8 liters