Write a Formula for the General Term (The Nth Term) $a _ { n } = 2 n - 4 ; a _ { 20 } = 36$

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.
-2 , 6 , 10 , 14 , 18 , . . .

A) $a _ { n } = 2 n - 4 ; a _ { 20 } = 36$
B) $a _ { n } = 4 n + 2 ; a _ { 20 } = 82$
C) $a _ { n } = 4 n - 2 ; a _ { 20 } = 78$
D) $a _ { n } = n + 4 ; a _ { 20 } = 24$