A flower bed has the shape of a rectangle 7 yards long and 4 yards wide. What is its area in square feet?
To find the area of the flower bed, we need to convert the dimensions from yards to feet.
Since 1 yard is equal to 3 feet, the length of the flower bed is 7 yards * 3 feet/yard = 21 feet.
Similarly, the width of the flower bed is 4 yards * 3 feet/yard = 12 feet.
The area of the rectangle is calculated by multiplying the length by the width: 21 feet * 12 feet = 252 square feet.
Therefore, the area of the flower bed is 252 square feet. Answer: \boxed{252}.