Answer
$a_1=825$ dollars
$d=-21$ dollars
Work Step by Step
In an arithmetic sequence, the common difference can be calculated as the difference of any two subsequent terms:
$d=a_2-a_1=804-825=-21$ dollars
The first term is:
$a_1=825$ dollars.
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 14 - Sequences, Series, and the Binomial Theorem - 14.2 Arithmetic Sequences and Series - 14.2 Exercise Set - Page 902: 12
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