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Mathematics 7 Online
OpenStudy (anonymous):

a square piece of cardboard with side 45 inches is to be made into an open topped tray by cutting out square corner notches and turning up the remaining flaps. if the tray must have a volume of 4500 cubic inches, what size squares must be cut out?

hero (hero):

(45-2x)(45-2x)(x) = 4500

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