SOLUTION: find 139th term of the arithmetic sequence whose first term is -28 and the common difference is 1/3

Algebra ->  Sequences-and-series -> SOLUTION: find 139th term of the arithmetic sequence whose first term is -28 and the common difference is 1/3       Log On


   

Question 1162806: find 139th term of the arithmetic sequence whose first term is -28 and the common difference is 1/3
Answer by ikleyn(52775) About Me  (Show Source):
You can put this solution on YOUR website!
.

The general formula for the n-th term of an AP is


    a%5Bn%5D = a%5B1%5D + (n-1)*d.


So, substitute  a%5B1%5D = -18,  n= 139  and d = 1%2F3  into the formula and calculate.

--------------

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.