Find an Explicit Rule for the Nth Term of the Arithmetic

Multiple Choice

Find an explicit rule for the nth term of the arithmetic sequence.
- $$- 20 , - 14 , - 8 , - 2 , \ldots$$

A) $a _ { n } = - 20 + 6 ( n + 2 )$
B) $a _ { n } = - 20 \times 6 ( n - 1 )$
C) $a _ { n } = - 20 + 6 ( n - 1 )$
D) $a _ { n } = - 20 + 6 ( n + 1 )$