#### Answer

3

#### Work Step by Step

We use the theorems in the chapter to obtain:
$6^2 = (CD)(9+CD) \\ CD^2 +9CD - 36 = 0 \\ (CD +12)(CD-3) = 0 \\ CD =3$
Note, CD cannot be negative.

Published by
Brooks Cole

ISBN 10:
1439047901

ISBN 13:
978-1-43904-790-3

3

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