Find the 10th term of the arithmetic sequence: 3, 7, 11, 15, ..., 35, 36, 39, 41, Find the common difference of the sequence:12, 18, 24, 30, ..., 4, 5, 6, 7, Find the missing term in the sequence: 5, 9, _, 17,21, 11, 12, 13, 14, Find the 15th term of the sequence: 2, 5, 8, 11, ..., 41, 42, 43, 44, Find the sum of the first 10 terms of the sequence: 1, 4, 7, 10, ..., 135, 145, 155, 165, Find the next term of the sequence: 20, 16, 12, 8, ..., 2, 3, 4, 5, Find the 12th term of the sequence: 7, 10, 13, 16, ..., 37, 38, 39, 40, Find the common difference of the sequence:50, 45, 40, 35, ..., -3, -4, -5, -6, Find the sum of the first 8 terms of the sequence: 2, 6, 10, 14, ..., 112, 128, 144, 160, Find the missing term in the sequence:30, 25, _, 15, 10, 18, 19, 20, 21.

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