#### Answer

d = $\frac{4D}{f}$

#### Work Step by Step

Solve for k by isolating it to one side of the equation:
D = $\frac{1}{4}$fk
Multiply both sides by 4:
4D = fk
Divide both sides by f:
$\frac{4D}{f}$ = k

Published by
Pearson

ISBN 10:
0321726391

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

d = $\frac{4D}{f}$

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