Answer
$-12$
Work Step by Step
By the rule of adding numbers of the same sign,
$(-3)+(-3)+(-3)+(-3)=-(3+3+3+3)=-(4\times 3)$
$=-12$
Introductory Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-805-X
ISBN 13:
978-0-13417-805-9
Chapter 1 - Section 1.6 - Subtraction of Real Numbers - Exercise Set - Page 73: 134
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