- What percent of letters don't reach their destination each year in the US?

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What is the formula for the area of a cylinder? Let p be the point (-2,5).Let L be the line that pass through (-2,1) and (0,-3). Find the point on L that is closest to p.? Please help on 1 geometry question? Find all solutions in the interval [0, 2π). sin2x + sin x = 0? How do diodes regulate potential difference?