What are the explicit equation and domain for an arithmetic sequence with a first term of 5 and a second term of 2? (5 points)    a = 5 - 2(n - 1); all integers where n ≥ 1     an = 5 - 2(n - 1); all integers where n ≥ 0     an = 5 - 3(n - 1); all integers where n ≥ 1     an = 5 - 3(n - 1); all integers where n ≥ 0