Evaluate the Sum $$\sum _ { k = 3 } ^ { 6 } ( 2 k - 3 )$$

Multiple Choice

Evaluate the sum. Round to two decimal places, if necessary.
- $$\sum _ { k = 3 } ^ { 6 } ( 2 k - 3 )$$

A) 21
B) 27
C) 24
D) 15