A Parabolic Arch Spans a Stream 220 Feet Wide

question 20

Multiple Choice

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

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