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A 72kW crane lifts a 2 ton weight with 1 mps constant velocity. Calculate the efficiency? 4x-y=3y+7 x+8y=4 I think? based on the system of equations above, what is the value of the product xy? Explain how waterfalls are useful? Characteristics of antibody? The height of a triangle is twice the length of its base. The area of the triangle is 50m^2. Find the height and base to the nearest tenth.?