Answer
602.08 pounds
Work Step by Step
$R=\sqrt {A^2+B^2}$
$850 = \sqrt {600^2+B^2}$
$850^2=(\sqrt {600^2+B^2})^2$
$722500=600^2+B^2$
$722500=360000+B^2$
$362500=B^2$
$\sqrt {362500} =\sqrt {B^2}$
$602.08 = B$
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