Find the indicated quantity of the arithmetic sequence.
-$a _ { 1 } = 6 , a _ { n } = - 74 , d = - 4 ; \text { find } n$
A)21
B)22
C)20
D)17

Name: Find the indicated quantity of the arithmetic sequence. -$a _ { 1 } = 6 , a _ { n } = - 74 , d = - 4 ; \text { find } n$ A)21 B)22 C)20 D)17
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Question

Quizplus · Accepted Answer

The formula for the nth term of an arithmetic sequence is $a_n = a_1 + (n - 1)d$. Substituting the given values, we get $-74 = 6 + (n - 1)(-4)$. Solving for $n$, we find $n = 21$.

Find the Indicated Quantity of the Arithmetic Sequence a1=6,an=−74,d=−4; find na _ { 1 } = 6 , a _ { n } = - 74 , d = - 4 ; \text { find } na1​=6,an​=−74,d=−4; find n

Find the Indicated Quantity of the Arithmetic Sequence $a _ { 1 } = 6 , a _ { n } = - 74 , d = - 4 ; \text { find } n$