What is the appropriate method to calculate the cubic volume of a tank?

To calculate the cubic volume of a tank, the method involves multiplying the length, width, and height of the tank. This product gives you the total volume in cubic units. When thinking about a rectangular tank, the formula stems from the fundamental geometric principle that the volume of a rectangular prism (like a tank) is determined by these three dimensions.

Using length, width, and height correctly accounts for the three-dimensional space that the tank occupies. The volume measurement you derive from this formula helps in understanding how much water or fluid the tank can hold, which is crucial for water management and operational calculations in a water treatment setting.

The other choices do not represent the correct formula for volume calculation. For instance, addition or any combination of addition and multiplication as presented in the other choices fails to account for the three-dimensional space necessary for calculating volume accurately.