Which point would map onto itself after a reflection across the line y = -x? (-4,-4) (-4,0) (0,-4) (4,-4)

The area of a rectangle is 10 cm^2. one side of the rectangle is x cm. express the perimeter of the rectangle in terms of x and show that this rectangle cannot have a perimeter of 12 cm. the perimeter of the rectangle in terms of x is __ cm