Solve.A rectangular board is 2 ft by 18 ft. How far from the center of the board should the foci be located in order to cut the largest elliptical tabletop from the board?
A. 0.1 ft
B. 8.9 ft
C. 1.0 ft
D. 8.0 ft
Answer: B
Mathematics
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A. 32
B. 
C. - 
D. not a real number
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