Answer
The number is $-10$.
Work Step by Step
Let $x = $ the unknown number
$40 + 4x = 0$
$4x = -40$
$x = \frac{-40}{4}$
$x = -10$
Basic College Mathematics (9th Edition)
by Lial, Margaret L.; Salzman, Stanley A.; Hestwood, Diana L.
Published by
Pearson
ISBN 10:
0321825535
ISBN 13:
978-0-32182-553-7
Chapters 1-9 - Cumulative Review Exercises - Page 706: 26
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