An open rectangular box has an area of 441 cm2. If its length must be 3 times its width, find its dimensions so that its volume is a maximum. О 1) 7.25 сm, 21.75 ст, 4 ст O 2) 7 cm, 21 cm, 5.25 cm 3) 7 cm, 21 cm, 6.5 cm О 4) 6.5 ст, 19.5 сm, 6 ст

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