The formula for any arithmetic sequence is a n = a 1 + d(n - 1), where a n represents the value of the nth term, a 1 represents the value of the first term, d represents the common difference, and n represents the term number. what is the formula for the arithmetic sequence -7, -3, 1, 5, an = 5 + 4(n - 1) an = 4 + (-7)(n - 1) an = -7 + 4(n - 1) an = -7 + 5(n - 1)