Final answer:
The area of the flower bed, which is a rectangle that measures 21 feet by 12 feet, is 252 square feet. Since there are 9 square feet in a square yard, the area in square yards is 28.
Step-by-step explanation:
To find the area of a rectangle, you multiply the length by the width. In this case, the rectangle is 21 feet long and 12 feet wide. However, we need the area in square yards, not in square feet. There are 3 feet in a yard, which means there are 3 * 3 = 9 square feet in one square yard. We first find the area in square feet and then convert it to square yards.
The area in square feet is 252 square feet (21 feet * 12 feet). To get square yards, we divide the area in square feet by 9 (252 square feet / 9). Therefore, the area of the flower bed is 28 square yards.