Write a Formula for the General Term (The Nth Term) $a _ { n } = 5 n + 16 ; a _ { 20 } = 116$

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.
--21, -26 , -31, -36, . . .

A) $a _ { n } = 5 n + 16 ; a _ { 20 } = 116$
B) $a _ { n } = 5 n + 21 ; a _ { 20 } = 121$
C) $a _ { n } = - 5 n - 16 ; a _ { 20 } = - 116$
D) $a _ { n } = - 5 n - 21 ; a _ { 20 } = - 121$