SOLUTION: Find the arithmetic mean of the terms: an–1 = –4; an+1 =  –11 a. –7.5 b. –3.5 c. 44

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Question 1086826: Find the arithmetic mean of the terms: an–1 = –4; an+1 =  –11
a. –7.5
b. –3.5
c. 44
Answer by ikleyn(52781) About Me  (Show Source):
You can put this solution on YOUR website!
.
For arithmetic progression,  a%5Bn%5D = %28a%5Bn-1%5D+%2B+a%5Bn%2B1%5D%29%2F2.


Having this hint, can you complete the assignment on your own ?


On arithmetic progressions, see the lessons in this site:
    - Arithmetic progressions
    - The proofs of the formulas for arithmetic progressions
    - Problems on arithmetic progressions
    - Word problems on arithmetic progressions
    - Mathematical induction and arithmetic progressions
    - One characteristic property of 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".