Use the Formula for the Sum of the First N $$\sum _ { i = 1 } ^ { 39 } ( - 2 i - 1 )$$

question 152

Multiple Choice

Use the formula for the sum of the first n terms of an arithmetic sequence to find the indicated sum.
- $$\sum _ { i = 1 } ^ { 39 } ( - 2 i - 1 )$$

• A) \(- 1599\)
• B) \(- 1560\)
• C) \(- 1404\)
• D) \(- 1267.5\)

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