Answer
The sum of 12 and a number $a$.
Work Step by Step
The translation of the addition operation in word phrase is "sum."
Thus, $12+a$ means: "The sum of 12 and a number $a$."
Algebra 1
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133500403
ISBN 13:
978-0-13350-040-0
Chapter 1 - Foundations for Algebra - Chapter Review - 1-1 Variables and Expressions - Page 69: 12
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