#### Answer

21

#### Work Step by Step

Plugging in the given value of $x$, we find:
$$f(x)=7x-7 \\ f(4) =7(4)-7 = 21 $$

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Published by
McDougal Littell

ISBN 10:
0618595414

ISBN 13:
978-0-61859-541-9

21

Plugging in the given value of $x$, we find:
$$f(x)=7x-7 \\ f(4) =7(4)-7 = 21 $$

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