Use the Formula for the General Term of an Arithmetic Sequence
-Find $a _ { 60 }$ when $a _ { 1 } = 9 , d = - 4$.
A) $- 227$
B) $- 231$
C) 245
D) 249

Question

Quizplus · Accepted Answer

The formula for the general term of an arithmetic sequence is given by:
$$a_n=a_1+(n-1)d$$
where $a_n$ is the $n$th term, $a_1$ is the first term, $d$ is the common difference, and $n$ is the number of terms.

In this problem, we are given $a_1=9$ and $d=-4$, and we need to find $a_{60}$. Substituting these values into the formula, we get:
$$a_{60}=9+(60-1)(-4)=9-236=-227$$

Therefore, the answer is A) $-227$.

Use the Formula for the General Term of an Arithmetic a60a _ { 60 }a60​

Use the Formula for the General Term of an Arithmetic $a _ { 60 }$