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Write the mathematical expression that describes the arithmetic sequence: 20, 18.5, 17, 15.5, 14. Use sigma notation to describe the sum of the first...

Write the mathematical expression that describes the arithmetic sequence: 20, 18.5, 17, 15.5, 14...

Use sigma notation to describe the sum of the first ten terms of the arithmetic sequence.


Write the mathematical expression that describes the geometric sequence: 40,-10,5/2, -5/8, 5/32

Use sigma notation to describe the sum of the first ten terms of the geometric sequence.

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