Answer
$1$
Work Step by Step
$1$ is a natural number. Since it is a natural number, it must also be a whole number and an integer, as these sets include the natural numbers.
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter P - Section P.1 - Algebraic Expressions, Mathematical Models, and Real Numbers - Exercise Set - Page 17: 41
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