SOLUTION: Find the arithmetic mean of the terms: an–1 = 20; an+1 = 30.

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Question 1087180: Find the arithmetic mean of the terms: an–1 = 20; an+1 = 30.
Answer by ikleyn(52903) About Me  (Show Source):
You can put this solution on YOUR website!
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Read the solution to the similar problem
https://www.algebra.com/algebra/homework/Finance/Finance.faq.question.1087182.html

https://www.algebra.com/algebra/homework/Finance/Finance.faq.question.1087182.html


and do THE SAME.