Write the first n terms of the given arithmetic sequence (the value of n is indicated in the question).
-$$a _ { 1 } = 86 , d = 7$$
A) $a _ { n } = 86 - 7 n , a _ { 6 } = 44$
B) $a _ { n } = 86 - 7 ( n - 1 ) , a _ { 6 } = 51$
C) $a _ { n } = 86 + 7 n , a _ { 6 } = 128$
D) $a _ { n } = 86 + 7 ( n - 1 ) , a _ { 6 } = 121$

Question

Quizplus · Accepted Answer

The formula for the nth term of an arithmetic sequence is $a_n = a_1 + d(n - 1)$, where $a_1$ is the first term and $d$ is the common difference. Substituting $a_1 = 86$ and $d = 7$ gives $a_n = 86 + 7(n - 1)$. For $n = 6$, $a_6 = 86 + 7(6 - 1) = 86 + 35 = 121$.

Write the First N Terms of the Given Arithmetic Sequence a1=86,d=7a _ { 1 } = 86 , d = 7a1​=86,d=7

Write the First N Terms of the Given Arithmetic Sequence $a _ { 1 } = 86 , d = 7$