I would say 7 because if you divide 28\4 you get 7 and if you add 7 four times you get 28 for WY+XZ=28
If y=15 then x=45 because 45 minus 15 is 30
Hope this helps :))
The answer
<span>the third rope to counterbalance Sam and Charlie is F
and vectF +vectF1 +vectF2 =vect0
let's consider axis
y'y </span>vectF = -F
vectF 1= F1cos60
vectF 2= F2cos45
-F = -F1cos60-F2co45
so F= F1cos60+F2co45= 350x0.5+400x0.7=457.84 pounds
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