Final answer:
To find the area of the rectangle, multiply its length by its width. Then convert the area to square meters by multiplying it by the conversion factor of 1 kilometer = 1000 meters.
Step-by-step explanation:
To find the area of a rectangle, we multiply its length by its width. In this case, the length of the rectangle is 28 kilometers and the width is (x-3) kilometers. So the area of the rectangle is 28(x-3) square kilometers.
However, to convert the area to square meters, we need to multiply it by the conversion factor of 1 kilometer = 1000 meters. This gives us the area in square meters: 28(x-3) * 1000 square meters.