#### Answer

$63$

#### Work Step by Step

$-9i \cdot 7i = -63i^2 = -63(-1) = 63$

Published by
Pearson

ISBN 10:
0321726391

ISBN 13:
978-0-32172-639-1

$63$

$-9i \cdot 7i = -63i^2 = -63(-1) = 63$

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