You will need 288 tiles at minimum.
80
aprox 10 sq ft.
Assuming it's a 4x4 wall, 64 tiles
6
Assuming none are broken during the installation process, 64 full tiles will be required.
-3.5
4 feet times 3 feet equals 12 square feet.
80 sqf (length times width)
No, the adhesive won't hold.
regina wants to cover one wall of her room with wallpaper.The wall is 9feet high and 15 feet wide.There is a doorway in the wall that is 3 feet high and 7 feet wide. how many square feet of wallpaper will she need to buy>
The wall, 4 ft x7 ft, is 28 ft2. Each tile, .5 ft x .5 ft, is .25 ft2. 28ft2 divided by .25 ft2 = 112. However, that doesn't account for the grouted spaces between the tiles which, depending upon the width of the spaces, would somewhat reduce the number of tiles required.
If you're talking floor tiles as opposed to wall tiles and by 12x12 you mean they are 12 inches square, then the answer is 300. Because each tile is one square foot and a 15'x20' room is 300 square feet. Simple, eh?