Use the formula for the general term (the nth term) of an arithmetic sequence to find the indicated term of the sequence
with the given first term, a1, and common difference, d.
-Find a 17 when a1 = -4 , d = - 1 .
A) 12
B) 13
C) - 20
D) - 21

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, $a_{17} = -4 + (17 - 1)(-1) = -4 + 16(-1) = -4 - 16 = -20$.

Use the Formula for the General Term (The Nth Term)