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A hall 140 feet in length is to be designed as a whispering gallery. If the foci are located 25 feet from the center, how

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A hall 140 feet in length is to be designed as a whispering gallery. If the foci are located 25 feet from the center, how high will the ceiling be at the center? The ceiling will be about | feet high. (Type an integer or decimal rounded to one decimal place as needed.)

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