Find the first term and the common difference of the arithmetic sequence described. Give a recursive formula

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Find the first term and the common difference of the arithmetic sequence described. Give a recursive formula for the sequence. Find a formula for the nth term. 

9th term is 15th term is 31

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Related Book For  answer-question

Precalculus

ISBN: 978-0321716835

9th edition

Authors: Michael Sullivan

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