A parabolic arch spans a stream 220 feet wide. How high above the stream must the arch be to give a minimum clearance of 20 feet over a channel in the center that is 180 feet wide? 

A. 20 feet
B. 31.325 feet
C. 60.5 feet
D. 80.5 feet
E. 34.725 feet


Answer: C

Mathematics

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