SOLUTION: write a simplified explicit formula for the sequence 20, 13, 6, -1...

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Question 1115227: write a simplified explicit formula for the sequence
20, 13, 6, -1...
Answer by ikleyn(52858) About Me  (Show Source):
You can put this solution on YOUR website!
.
a%5Bn%5D = 20 - (n-1)*7.


Arithmetic progression, first term 20, common difference of -7.

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On arithmetic progressions,  see introductory lessons in this site:
    - Arithmetic progressions
    - The proofs of the formulas for arithmetic progressions
    - Problems on arithmetic progressions
    - Word problems on arithmetic progressions
    - Solved problems on arithmetic progressions


Also,  you have this free of charge online textbook in ALGEBRA-II in this site
    - ALGEBRA-II - YOUR ONLINE TEXTBOOK.

The referred lessons are the part of this online textbook under the topic "Arithmetic progressions".


Save the link to this textbook together with its description

Free of charge online textbook in ALGEBRA-II
https://www.algebra.com/algebra/homework/complex/ALGEBRA-II-YOUR-ONLINE-TEXTBOOK.lesson

into your archive and use when it is needed.