1: find the n-th of 3, -6, +9, -12, . . . ANSWER := , n= 1, 2, 3, 4, . . . Notice that I edited your post by placing commas where they should be . . . 2: find the n-th term of -1, +1/2, -1/3, 1/4, . . . ANSWER : = , n= 1, 2, 3, 4, . . . Notice that I edited your post by placing commas where they should be . . .