You are wallpapering a wall 10 feet wide and 12 feet high with a square window with 3 foot sides. how many square feet of wallpaper do you need to cover the wall?

Hey there!

First you need to see how much you need to buy, and when you do 10 x 12 = 120.

So you need at least 120 feet to cover the wall.
 Now you have to factor in the wall, when you do 3 x 3 (B x H) = 9.
Now do, 120 - 9 = 111.

So you need 111 square feet to cover the wall.

Hope this helps!