## Prealgebra (7th Edition)

Published by Pearson

# Chapter 1 - Section 1.8 - Introduction to Variables, Algebraic Expressions, and Equations - Exercise Set - Page 81: 1

#### Answer

$+$ : 28 $-$ : 14 $\times$ : 147 $\div$ : 3

#### Work Step by Step

Substitute the given values and solve. $a+b=21+7=28$ $a-b=21-7=14$ $a\times b=21\times7=147$ $a\div b=21\div7=3$

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