Determine the general term and recursive formula for the arithmetic sequence 28,20,12

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Determine the general term and recursive formula for the arithmetic sequence 28,20,12...

2-Determine the general term and recursive formula for the geometric sequence -640, -320, -160,..

3-State the first five terms of the arithmetic sequence tn=5n

4-state the first five terms of the geometric sequence tn=4^n - 3

5- Determine the sum of the arithmetic series 2+14+26+...+146

6-Determine the sum of the geometric series 7-14+28- ... -3584