SOLUTION: find N of the arithmetic sequence a1=-6, aN=-23, d=-1

SOLUTION: find N of the arithmetic sequence a1=-6, aN=-23, d=-1

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Question 332879: find N of the arithmetic sequence a1=-6, aN=-23, d=-1
Answer by jrfrunner(365) (Show Source): You can put this solution on YOUR website!
in an arithmetic sequence,
the nth term is defined as :
therefore
given: , and d = -1, substitute into and solve for n
-23=-6+(n-1)*(-1)
-23+6=-(n-1)
17=n-1
18=n
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so, is the 18th term.
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