Chapter 11 - Section 11.2 - Arithmetic and Geometric Sequences - Exercise Set - Page 647: 64

The first four terms of the sequence are: $\$3720$ $,$ $\$3451.5$ $,$ $\$3183$ $,$ $\$2914.5$

$a_{1}=\$3720$ $,$ $d=-\$268.5$ Add the common difference $d$ to each term to get the next one. $a_{1}=\$3720$ $a_{2}=\$3720+(-\$268.5)=\$3451.5$ $a_{3}=\$3451.5+(-\$268.5)=\$3183$ $a_{4}=\$3183+(-\$268.5)=\$2914.5$