Write a Formula for the General Term (The Nth Term) $a _ { n } = 27 - 9 n ; a _ { 20 } = - 153$

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.
-27, 18 , 9, 0, . . .

A) $a _ { n } = 27 - 9 n ; a _ { 20 } = - 153$
B) $a _ { n } = 36 - 9 n ; a _ { 20 } = - 144$
C) $a _ { n } = 9 n - 27 ; a _ { 20 } = 153$
D) $a _ { n } = 9 n - 36 ; a _ { 20 } = 144$