Answer:
2 1/2 feet
Step-by-step explanation:
The cost is said to be ...
355 = n^2/5 +175
180 = n^2/5 . . . . . . subtract 175
900 = n^2 . . . . . . multiply by 5
30 = n . . . . . . . . take the square root
The value of n is the dimension of the window in inches. We want to know the dimension in feet. There are 12 inches in a foot, so the dimension is ...
(30 in)/(12 in/ft) = 30/12 ft = 5/2 ft = 2 1/2 ft
The length of the window is 2 1/2 feet.
