Length + width = ½ of perimeter ie 9 units. Area could be anything from 8 square units (8 x 1) to 20 square units (5 x 4), assuming there are no fractional measurements and that rectangle is not a square.
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17. A 4x4 rectangle has a perimeter of 16 units and an area of 16 square units. A 3x6 rectangle has a perimeter of 18 units and an area of 18 square units. The number 17 is halfway between 16 and 18.
Perimeter: 2(4+5) = 18 units Area: 4*5 = 20 square units
The answer will depend on what those numbers represent and their units. It is possible that the question gives 18 and 5 units as the length and width of a rectangle and requires you to find the area and perimeter. Or It is possible that the question has given 18 in some units and 5 in some other units and requires you to determine which one could be the area and which the perimeter.
Its length could be 5 units and its width 4 units.
Assuming that the fact that it is a rectangle means that it cannot be a square, then it can have any value in the interval (0, 20.25) square units. This depends on whether the rectangle is a long thin shape or a near-square.