#### Answer

$-7i$

#### Work Step by Step

We know that $\cos270^{\circ}=0$ and $\sin270^{\circ}=-1$
Substituting these values in the expression and solving:
$7(\cos270^{\circ}+i\sin270^{\circ})=7(0-1i)=-7i$

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Published by
Pearson

ISBN 10:
978-0-13-421743-7

ISBN 13:
978-0-13421-743-7

$-7i$

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