# Chapter 1 - Introduction to Algebraic Expressions - Study Summary - Practice Exercises - Page 74: 25

$21$

#### Work Step by Step

To multiply integers, multiply the numbers ordinarily. If the signs of the 2 factors are the same, the product is positive. If the signs of the two factors are different, the product is negative. Hence, the product of the given expression, $-3(-7) ,$ is $21 .$

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