Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 12 Sequences and Series - 12.2 Analyze Arithmetic Sequences and Series - 12.2 Exercises - Skill Practice - Page 806: 28



Work Step by Step

We know that the general formula of an arithmetic sequence is given by $\dfrac{1}{2}= a_1+(11-1)-\dfrac{1}{2}$ Here, we have $a_1=\dfrac{11}{2} ; d=-13$ $a_n=\dfrac{11}{2}+(n-1) \times (-\dfrac{1}{2})$ This gives: $a_n=\dfrac{12-n}{2}$ Hence, $a_n=\dfrac{-1}{2}n+6$
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