1,4,9,25,36,49,64,81,100................
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9 square feet is a square yard.90 square feet is 10 square yards.10 square yards at 11 per square yard is 110 just for the tiles.Unless the tiles perfectly fit the area to be covered, you will need to purchase extra tiles since a number of tiles will have to be cut to fit against the wall.For a bathroom you still need to add the cost of tile adhesive, grout, and labor :)
Because prime numbers only have one factor pair.
If the 6x12 tiles are in inches, it will take two of them to cover a square foot. You will need 210 of them.
Each tile covers 81 square inches. You have 1,296 square inches to cover. It will take 16 tiles to cover that area.
The answer will depend on the units used for 12 x 12. It should be blindingly obvious to anybody that the number of 12 inch x 12 inch tiles or 12 cm x 12 cm tiles will be quite different.