#### Answer

$A=D$.

#### Work Step by Step

Because the set $D$ does not contain its boundary points $-1$ and $3$, it is equal to the set $A$.

Published by
Cengage Learning

ISBN 10:
0-49539-132-8

ISBN 13:
978-0-49539-132-6

$A=D$.

Because the set $D$ does not contain its boundary points $-1$ and $3$, it is equal to the set $A$.

You can help us out by revising, improving and updating this answer.

Update this answerAfter you claim an answer you’ll have **24 hours** to send in a draft. An editor
will review the submission and either publish your submission or provide feedback.