#### Answer

The number $9$ is added to each side of the inequality.

#### Work Step by Step

The given inequality is
$-1\geq b-9$
Add $9$ to each side.
$-1+9\geq b-9+9$
Simplify.
$8\geq b$
Hence, the number $9$ is added to each side of the inequality.

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ISBN 10:
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ISBN 13:
978-1-60840-838-2

The number $9$ is added to each side of the inequality.

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