Answer
$8+x$
Work Step by Step
"The sum of" means that the following terms will be added together. Since the instructions say to use $x$ to represent an unknown number, the sum of 8 and a number would be $8+x$.
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 2 - Section 2.1 - Linear Equations in One Variable - Exercise Set - Page 56: 68
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