Answer
variable.
Work Step by Step
Variables are used to represent unknown numbers, and are usually a letter. For example, in $\pi r^{2}$, $r$ would be considered a variable.
Introductory Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-805-X
ISBN 13:
978-0-13417-805-9
Chapter 1 - Section 1.1 - Introduction to Algebra: Variables and Mathematical Models - Concept and Vocabulary Check - Page 10: 3
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