23.1 A 1,500-ft vertical curve is to be used for joining a +3.0% grade line and a-4.0% grade line. The vertex or intersection of the grade lines is at station 57 + 00 and the elevation there is 583.25 ft. Compute the elevations at 100-ft stations throughout the curve. (Ans.: Curve elevation at stations 53, 55, and 59 = 568.39 ft, 570.19 ft, 568.19ft)

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