Answer
$p=2$
Work Step by Step
$-4p+21=13$
$-4p+21-21=13-21$ (Subtracting $21$ from both sides)
$-4p=-8$
$4p=8$
$p=\frac{8}{4}=2$
Intermediate Algebra: Connecting Concepts through Application
by Clark, Mark; Anfinson, Cynthia
Published by
Brooks Cole
ISBN 10:
0-53449-636-9
ISBN 13:
978-0-53449-636-4
Appendix A - Basic Algebra Review - A Exercises - Page A-15: 72
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