Basic College Mathematics (9th Edition)

Published by Pearson
ISBN 10: 0321825535
ISBN 13: 978-0-32182-553-7

Chapters 1-9 - Cumulative Review Exercises: 26

Answer

The number is $-10$.

Work Step by Step

Let $x = $ the unknown number $40 + 4x = 0$ $4x = -40$ $x = \frac{-40}{4}$ $x = -10$
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