Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 11 - Section 11.1 - Finding Limits Using Tables and Graphs - Exercise Set - Page 1142: 96


a. $-6n+8$ b. $-172$ c. $-2550$

Work Step by Step

a. Based on the given sequence, we have $a_1=2, d=-4-2=-6$ Thus $a_n=a_1+(n-1)d=2-6(n-1)=-6n+8$ b. For $n=30$, we have $a_{30}=-6(30)+8=-172$ c. For the sum, we have $S_n=\frac{n(a_1+a_n)}{2}$ and $a_{30}=\frac{30(2-172)}{2}=-2550$
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