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Find two vectors v1 and v2 whose sum is <0, −3>, where v1 is parallel to <−4,−2> while v2 is perpendicular to <−4,−2>? Why are the levels of variables (nominal, ordinal, interval, ratio) important? In unit operations, what is the difference between purification and concentration? Give examples each.? What is a chip formula number? Are mosquitoes the deadliest creatures on earth?