SOLUTION: Find the 1st element of an arithmetic sequence whose 18th term is 20 and whose common difference is -2.

SOLUTION: Find the 1st element of an arithmetic sequence whose 18th term is 20 and whose common difference is -2.

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Question 1039661: Find the 1st element of an arithmetic sequence whose 18th term is 20 and whose common difference is -2.
Answer by ikleyn(52788)   (Show Source): You can put this solution on YOUR website!
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On arithmetic progressions see the lessons
    Arithmetic progressions
    The proofs of the formulas for arithmetic progressions
    Problems on arithmetic progressions
    Word problems on arithmetic progressions
in this site.

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