Warren measured a rectangular window to find out how much plastic he would need to cover it. the window measures 5 ft 6 inches by 2 ft 9 inches. about how many inches of plastic does warren need to cover the window.

The surface to cover is equal to the area of the window, we can calculate that easily if we convert the original data to units of inches alone, we have the conversion:
1 feet = 12 inches
So we convert the measures:
5 ft 6 in = 5(12) + 6 = 66 in
2 ft 9 in = 2(12) + 9 = 33 in
So we calculate the wiindow area multiplying the two quantities given:
area = (66 in)(33 in)
area = 2178 squared inches
therefore Warren needs this quantity of plastic to cover the window