Write a formula for the general term (the nth term)of the arithmetic sequence. Then use the formula for $r a _ { n }$ to find $a _ { 20 }$ , the 20th term of the sequence.
-$2,6,10,14,18 , \ldots$
A) $a _ { n } = 4 n - 2 ; a _ { 20 } = 78$
B) $a _ { n } = 2 n - 4 ; a _ { 20 } = 36$
C) $a _ { n } = 4 n + 2 ; a _ { 20 } = 82$
D) $a _ { n } = n + 4 ; a _ { 20 } = 24$

Question

Quizplus · Accepted Answer

The sequence starts at 2 and increases by 4 each time, so the formula is $a_n = 4n - 2$. For $a_{20}$, substituting $n = 20$ gives $a_{20} = 4(20) - 2 = 80 - 2 = 78$.

Write a Formula for the General Term (The Nth Term)of ranr a _ { n }ran​

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