SOLUTION: Express the general term a(n), (with n as a subscript), for an arithmetic sequence whose 7th term is 11 and 20th term is -41. Then find the 9th term.

Question 888309: Express the general term a(n), (with n as a subscript), for an arithmetic sequence whose 7th term is 11 and 20th term is -41. Then find the 9th term.
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!
General term of arithmetic sequence is a+(n-1)d using n as the index and d as the common difference.
The initial term is a.
n=7, term is 11;
n=20, term is -41.

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Start with Elimination Method to first find d.

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Using the n=7 equation,

General term is .
You can find whichever term you want.

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