Use the Formula for the General Term of an Arithmetic Sequence
-Find a 21 when a1 = 5, d = 1.
A)25
B)26
C)- 15
D)- 16

Name: Use the Formula for the General Term of an Arithmetic Sequence -Find a 21 when a1 = 5, d = 1. A)25 B)26 C)- 15 D)- 16
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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 $a_1 = 5$, $d = 1$, and $n = 21$, we get $a_{21} = 5 + (21 - 1)(1) = 5 + 20 = 25$.