Answer:Here are the rules (formulas) for the given sequences: 1. Sequence: 3, 6, 9, 12, 15This is an arithmetic sequence with a common difference of 3.Rule: a_n = 3n (where n is the term number)2. Sequence: 9, 11, 13, 15, 17This is an arithmetic sequence with a common difference of 2.Rule: a_n = 9 + 2(n-1) which simplifies to a_n = 2n + 7