Prealgebra (7th Edition)

Published by Pearson
ISBN 10: 0321955048
ISBN 13: 978-0-32195-504-3

Chapter 1 - Section 1.1 - Study Skill Tips for Success in Mathematics - Exercise Set - Page 7: 1


Because d is the only symbol available as an answer, the variable is d.

Work Step by Step

A variable is a symbol that represents a number that is unknown. In the expression 21 + d, d is the only symbol (letter) that represents a number we don't know yet. Therefore, d is the variable
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