Final answer:
The width of Mina's yard is 75.3 feet. This is found by dividing the given area of the yard by the given length of the yard.
Step-by-step explanation:
The subject of this mathematics problem is determining the width of Mina's rectangular yard. Since we know that the area of a rectangle is calculated as length times width, we can use the given information to solve for the width. We have the area (3162.6 ft.²) and the length (42 ft).
To find the width, we will therefore divide the area by the length. Using these values, the calculation would be: 3162.6 ft.² / 42 ft = 75.3 ft. Thus, the width of Mina's yard is 75.3 feet.
Learn more about Area of a Rectangle