4. [10 marks] A billboard is to be constructed so that it contains a rectangular printed advertisement with area 200 m2,
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4. [10 marks] A billboard is to be constructed so that it contains a rectangular printed advertisement with area 200 m2,
4. [10 marks] A billboard is to be constructed so that it contains a rectangular printed advertisement with area 200 m2, surrounded by margins that are 2 m wide on the top and bottom and 4 m wide on the left and right, as shown below. What are the length y and width x of the printed advertisement such that the entire billboard has a minimum area?
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