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

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) $- 1267.5$