Answer Happy

please help answers are provided already just need to know how
D.L>S 53. A horizontal curve has a design speed of 45 mph, e=2.5%, and f=0.10, what should be the minimum R? C A. 503 ft B. 328 ft C. 1082 D. 1802 ft 58) A horizontal curve has R-780 ft. What is the degree of curvature? A A. 7.35 degree B. 100 ft C. 7.35 rad D. 13.61 degree 50A horizontal ure has been constrated with subiche bahan I did