Final answer:
To calculate the area of a sidewalk that is 10 1/2 yards by 2 yards, we multiply the length by the width to get 21 square yards. This is the amount of bricks needed to lay the sidewalk.
Step-by-step explanation:
To determine how many square yards of bricks are needed to lay a sidewalk, we need to calculate the area of the sidewalk in square yards. The sidewalk measures 10 1/2 yards in length and 2 yards in width. To find the area, we multiply the length by the width:
Area = Length × Width
Area = 10.5 yards × 2 yards
Area = 21 square yards
Therefore, you would need to order 21 square yards of bricks to lay a sidewalk that is 10 1/2 yards by 2 yards.