## Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson

# Chapter 1 - Introduction to Algebraic Expressions - Study Summary - Practice Exercises: 23

#### Answer

$15$

#### Work Step by Step

The expression $a-(-b)$ simplifies to $a+b.$ Hence, the given expression, $6-(-9) ,$ simplifies to \begin{array}{l}\require{cancel} 6-(-9) \\\\= 6+9 \\\\= 15 .\end{array}

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