3. The plate is horizontal, is in equlibrium, and weighs H 1200 lb. Cable ABC wraps around ring B, which is H frictionless. Point B's coordinates are (40, 20, 80) in. B Determine the tension in cables ABC, BE, and BD. BC Use Excel to solve the system of equations, and submit your Excel file (along with the pdf file of your solutions to these problems). A C D 30 in. 40 in 60 in