#### Answer

$-35$

#### Work Step by Step

$5i \cdot 7i = 35i^2 = 35(-1) = -35$

Published by
Pearson

ISBN 10:
0321726391

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

$-35$

$5i \cdot 7i = 35i^2 = 35(-1) = -35$

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