Making the assumption, not justified by any information in the question, that the tiles are 18 inches by 18 inches in size and not some other units eg 18 cm2,
each tile covers 1.5ft*1.5ft = 2.25 sq ft.
To cover 1700 sq ft will require 1700/2.25 = 755.55... tiles or 756 tiles.
However, this assumes that ALL offcuts are used - a totally unrealistic assumption. Depending on your skill level, you should allow 5-10% extra.
67 tiles.
start with 38 tiles.
192 tiles
The answer depends on the measurement units used for 18x18.
22.2 tiles so buy 23 tiles.
118
288
12...
266.666666666 so rounding up 267 tiles.
10
The answer will depend on the units used for measuring the tiles which you have failed to specify.
To determine how many 18x18 inch tiles you need for 56 square feet, first convert the tile size to square feet. An 18x18 inch tile is 1.5x1.5 feet, which equals 2.25 square feet per tile. Next, divide the total area needed (56 sq ft) by the area of one tile (2.25 sq ft): 56 ÷ 2.25 ≈ 24.89. Therefore, you will need 25 tiles to cover 56 square feet.