The length of a rectangle window is 5 3/4 feet and its width is 3 1/2 the what is the area of this window

Area of a rectangle = Length × Width 
Area of a rectangle = 5 × 3
(Make the fractions decimals)
5 = 5.75
3 = 3.5
Area of a rectangle = 5.75 * 3.5
Area of the window = 20.12500 ft.²

The answer is 10. and if you go by pemdas you would 1. multiplication 2. division 3. addition 4. subtraction