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If a system does 1000J of work on its surrounding and 300J flows into dsystem.does the internal energy increase or decrease and by how much? 3 different Ways the k truss design is used in real life? Cant figure out how to verify this identity? 2. Construct a line that is perpendicular to line m and that passes through point P.? According to the tables, where do functions f(x) and g(x) intersect?