Answer:
Area of a rectangle(A) is multiply the length by its width.
i.e 
 where l is the length and w is the width of the rectangle respectively
 where l is the length and w is the width of the rectangle respectively
As per the given statement:
The area of the rug is 36 1/4 square feet the rug is 8 3/4.
⇒
 square feet.
 square feet.
and
width of a rug(w) = 
 feet.
 feet.
By definition of area;

Substitute the given values we get;

Divide both sides by 8.75 we get;
 l=4.14285714 feet
Therefore, the length of the rug is, 4.14285714 feet