Intermediate Algebra: Connecting Concepts through Application

Published by Brooks Cole
ISBN 10: 0-53449-636-9
ISBN 13: 978-0-53449-636-4

Chapter 9 - Conic Sections, Sequences, and Series - 9.3 Arithmetic Sequences - 9.3 Exercises - Page 728: 52

Answer

The sequence is arithmetic. Common difference: $d=-\frac{3}{5}$. General term: $a_{n}=-\frac{3}{5}n+\frac{43}{5}$

Work Step by Step

$\frac{37}{5}-8=\frac{34}{5}-\frac{37}{5}=\frac{31}{5}-\frac{34}{5}=\frac{28}{5}-\frac{31}{5}=5-\frac{28}{5}=-\frac{3}{5}$ We see that the difference between each term and the preceding term is same and is equal to $-\frac{3}{5}$. Therefore, the sequence is arithmetic with common difference $d=-\frac{3}{5}$. The general term $a_{n}$ is given by $a_{n}=a_{1}+(n-1)d$ As $a_1=8$ and $d=-\frac{3}{5}$, we have: $\implies a_{n}=8+(n-1)(-\frac{3}{5})=8-\frac{3}{5}n+\frac{3}{5}$ Or $a_{n}=-\frac{3}{5}n+\frac{43}{5}$
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