Final answer:
The first column of a table is typically used for identifiers or category labels, which act as reference points for other data in the table, such as explanations for mathematical operations with corresponding answers in the next column.
Step-by-step explanation:
The value often stored in the first column of a table is typically a descriptive element such as an identifier or a category label. This may serve as a reference point for the data in the subsequent columns. For example, in an Expected Value Table, the first column might list different possible outcomes or scenarios that are being analyzed. In a mathematics or science context, this can also include independent variables or specific explanation for mathematical operations like multiplication or division, as indicated by the tables that label the first column as 'Explanation'. The corresponding answer to these explanations is then provided in the subsequent column, making it easier to understand the process or result of the operation. The use of the first column for such purposes enables the reader to quickly discern the basis upon which the additional data or answers are presented.