Answer
6$\lt$x$\lt$36
Work Step by Step
The sum of lengths of two sides of a triangle must be greater than the length of the third side.
21-15$\lt$x$\lt$21+15
6$\lt$x$\lt$36
Algebra 1
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133500403
ISBN 13:
978-0-13350-040-0
Chapter 3 - Solving Inequalities - 3-6 Compound Inequalities - Practice and Problem-Solving Exercises - Page 205: 45
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