Answer
See below, $d=1$.
$5,6,7,8$
Work Step by Step
1. Based on the given expression, we have $s_n-s_{n-1}=n+4-(n-1+4)=1$, thus this sequence is arithmetic and the common difference is $d=1$.
2. The first four terms are $5,6,7,8$
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 11 - Sequences; Induction; the Binomial Theorem - Section 11.2 Arithmetic Sequences - 11.2 Assess Your Understanding - Page 834: 5
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