#### Answer

-$\frac{9}{10}$

#### Work Step by Step

-$\frac{9}{100}$ +$\frac{99}{100}$ =
=$\frac{-9+99}{100}$ =$\frac{-90}{100}$ =-$\frac{9\times10}{10\times10}$
= -$\frac{9}{10}$

Published by
Pearson

ISBN 10:
0321955048

ISBN 13:
978-0-32195-504-3

-$\frac{9}{10}$

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