Answer:

Step-by-step explanation:
we know that
To find out the area of the sidewalk, multiply the length by the width of the sidewalk
The width of the sidewalk is equal to

or

The area is equal to

Hello
All square numbers ends with 0,1,4,5,6 or 9 at units place.
1/2 - y (6y - 8)
1/2 -6y2 - 8y
the answer is A