Answer
$\Delta s_B = 1.33$
Work Step by Step
$2s_B+(s_B-s_C)=l$
$3s_B-s_C=l$
$3\Delta s_B - \Delta s_C=0$
Since $\Delta s_C=-4$, then
$3 \Delta s_B = 04$
$\Delta s_B = -1.33$ ft
$\Delta s_B = 1.33$ ft (towards the right)
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