Write a Formula for the General Term (The Nth Term) $a _ { n } = 6 n - 2 ; a _ { 20 } = 118$

Multiple Choice

Write a formula for the general term (the nth term) of the arithmetic sequence. Then use the formula for an to find a20,
the 20th term of the sequence.
-3 , 12 , 21 , 30 , 39 , . . .

A) $a _ { n } = 6 n - 2 ; a _ { 20 } = 118$
B) $a _ { n } = 9 n - 2 ; a _ { 20 } = 178$
C) $a _ { n } = 6 n - 9 ; a _ { 20 } = 111$
D) $a _ { n } = 9 n - 6 ; a _ { 20 } = 174$