A vertical cross section of a cooling tower is a portion of a hyperbola, as shown in the diagram below. The standard form of the equation of the hyperbolic cross section is 
where x and y are measured in feet. The horizontal cross sections of the tower are circles. 
What is the smallest radius of a horizontal cross section? Round to the nearest foot.
A) 52 feet
B) 50 feet
C) 72 feet
D) 54 feet
E) 60 feet
Correct Answer:
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