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. The slope of the back tangent of a parabolic curve is 4.2%, while the slope of the forward tangent is -3.6%. The length of

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. The slope of the back tangent of a parabolic curve is 4.2%, while the slope of the forward tangent is -3.6%. The length of curve is 120m. long with elevation of the P.C. equal to 82.77m. Determine the elevation of the curve directly below the P.I

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