Answer
The sum of 12 and a.
Work Step by Step
Two things are being added, so we say "the sum of" and list the two things being added, in this case 12 and a.
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 1 - Foundations for Algebra - Chapter Review - Page 69: 12
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