Write a Formula for the General Term (The Nth Term) $$\mathbf { a } _ { \mathbf { n } }$$

Multiple Choice

Write a formula for the general term (the nth term) of the arithmetic sequence. Then use the formula for $$\mathbf { a } _ { \mathbf { n } }$$ to find $$a _ { 20 }$$ , the 20th term of the sequence.
- $$a _ { n } = a _ { n - 1 } + 5 , a _ { 1 } = 18$$

A) $a _ { n } = 5 n + 13 , a _ { 20 } = 113$
B) $a _ { n } = 18 n - 13 , a _ { 20 } = 347$
C) $a _ { n } = 5 n + 23 , a _ { 20 } = 123$
D) $a _ { n } = 13 n + 5 , a _ { 20 } = 265$