Asked by Katie

given the arithmetic sequence 71,65,59 ... if a(n) is -43 what is the value of n
Answered by Reiny
a = 71, d = -6
term(n) = a + (n-1)d
-43 = 71 + (n-1)(-6)
-43 = 71 - 6n + 6
6n = 120
n = 20
Answered by Emmanuel
Answer
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