Answer:
140 sq. ft
Step-by-step explanation:
Given information: L= 14ft. W = 6c-8ft. L= 5+3c ft.
Equate the values of length.

Subtract 5 from both sides.

Divide both sides by 3.

The value of c is 3.
The width of the carpet is




The width of the carpet is 10 ft.
The area of a rectangle is

The area of carpet is


Therefore, Mr. arenth should order carpet of 140 sq. feet carpet.