For n = 1, 2, 3, 4 the sequence is -4, -5, -6, -7. It is arithmetic progression with the first term -4 and the common difference of -1. The general formula for the n-th term is= -4 + (n-1)*(-1) = -4 - (n-1) = -4 - n + 1 = -3 - n, n = 1, 2 , 3, 4 . . . ANSWER. = -3 - n, n = 1, 2, 3, 4, . . .