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A ranger wants to determine the height of a tree across a river. Elevation from bank 50°. Walls back 37 feet. New angle of elevation is 26°.? Are all waves in existence made up of an infinite number of sin waves? Does urine evaporate on different kinds of surfaces? What is the optimal size of a projection screen for a meeting if the closest viewers are 5.6m and farthest 16.7m away from it? Chem You want to make 5.00 L of a solution with a pH of 10.7. What mass of solid NaOH will be required to make this solution?