Final answer:
Without context, it is not possible to determine the total number of cubes added as the provided references do not relate to the addition of cubes.
Step-by-step explanation:
Based on the given information, there is not enough context provided to determine how many cubes were added in total. Without additional details that relate specifically to adding cubes, it is not possible to select the correct answer among the options provided (6, 8, 14, 2). The reference information provided talks about unit measures, outcomes in a probability scenario, checking the balance of charges and atoms in a chemical equation, the submersion of a polystyrene cube, and the operations of an air conditioner, but none of these connect directly to an operation involving the addition of cubes.