Answer
Arithmetic, $d=3$
Work Step by Step
Check the differences between consecutive terms:
$$4-1=3$$
$$7-4=3$$
$$10-7=3$$
$$13-10=3$$
Since differences are common, it is arithmetic.
College Algebra (11th Edition)
by Lial, Margaret L.; Hornsby John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
0321671791
ISBN 13:
978-0-32167-179-0
Chapter 7 - Section 7.3 - Geometric Sequences and Series - Summary Exercises on Sequences and Series - Page 658: 2
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