Final answer:
The length of fencing required to enclose a rectangular area is represented by the formula 2x + 2y, where x is the length and y is the width.
Step-by-step explanation:
To determine the length of fencing required to enclose a rectangular area, we need to add up the lengths of all four sides of the rectangle. Since a rectangle has two pairs of equal sides, we use the formula 2x + 2y where x is the length and y is the width of the rectangle. Therefore, the correct answer from the given options is 1) 2x + 2y.