To determine the rule for generating the next term in the sequence 23, 19.5, 16, 12.5, we first observe the differences between consecutive terms:
- 19.5 - 23 = -3.5
- 16 - 19.5 = -3.5
- 12.5 - 16 = -3.5
Since each term decreases by 3.5, this indicates that the sequence is an arithmetic sequence where the common difference is -3.5.
Therefore, the correct statement is:
Add the common difference of −3.5.