SOLUTION: Given the sequence{-1,3,7,11,...}, find a 25

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Question 1166729: Given the sequence{-1,3,7,11,...}, find a 25
Answer by ikleyn(52790) About Me  (Show Source):
You can put this solution on YOUR website!
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The pattern shows an arithmetic progression with the first term of -1 and the common difference of 4.


The general formula for the n-th term of an AP is  a%5Bn%5D = a%5B1%5D + d*(n-1).


In the given case  a%5B25%5D = -1 + 4*(25-1).


You can complete calculations on your own.


You are explained and instructed (!)

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For introductory lessons on arithmetic progressions see
    - Arithmetic progressions
    - The proofs of the formulas for arithmetic progressions
    - Problems on arithmetic progressions
    - Word problems on arithmetic progressions
in this site.

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.