one cubic foot contains 9 square feet
* * * * *
That is totally incorrect. A square foot is a measure of area - a 2-dimensional concept. A one foot cube is a 3-dimensional object. The two are measures of different things and it makes no sense to try to relate one to the other.
225 square feet
1,000 square feet.
108 square feet
None. Square feet is a measure of area. A foot or feet measure length.
360 square feet.
The question makes no sense. What on earth is a 18 foot square cube? Is it a cube each of whose faces is 18 square feet? Is it a cube each of whose edges is 18 feet - in which case why is the word "square" present?
225 square feet
300 square feet
340 square feet.
300
1,000 square feet.
108 square feet
165 square feet
A total of 160 square feet.
The answer is 270 square feet.
204 square feet.
on a wall it would be 100 square feet.