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I need someone look at my text. It's a formal mail to a teacher of a university. Is that possible if someone help me plz? Can you think of a system of expressions that is closed under multiplication and division? Support your answer with an example.? How can i find nail machine? Can someone please summarize this in 5 sentences using elementary school vocabulary? The hypotenuse of a 30°–60°–90° triangle is 3. What is the perimeter perimeter?