SOLUTION: Two terms of an arithmetic sequence are a9 = 85 and a30 = 295. Find a rule for the nth term.

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Question 388655: Two terms of an arithmetic sequence are a9 = 85 and a30 = 295. Find a rule for the nth term.
Answer by Fombitz(32388)   (Show Source): You can put this solution on YOUR website!

1.
.
.
2.
Subtract eq. 1 from eq. 2,



Then use either equation to solve for .


So then,
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