SOLUTION: 18. https://answers.yahoo.com/question/index?qid=20210419170616AA87mlx

Question 1179199: 18.
https://answers.yahoo.com/question/index?qid=20210419170616AA87mlx
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!
nth term of the an arithmetic sequence is:

given:

...........use to calculate

your formula is:

find

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