There is no sensible answer to this question. A 10' by 10' is a measure of area (square foot), with dimensions [L2]. A linear foot is a measure of distance, with dimensions [L]. Basic dimensional analysis teaches that you cannot convert between measures with different dimensions without additional information.
40 approximate square feet!
100
160 square feet. Multiply length by width to get square feet.
80
The floor and ceiling each have areas of 100 square feet. In order to find the areas of the walls, we need to know the height of the ceiling.
40 approximate square feet!
7 * 10 = 70 square feet.
120 square feet. Multiply length by width to get square feet.
100
300
160 square feet. Multiply length by width to get square feet.
120 square feet. Multiply length by width to get square feet.
80
80'2
160 square feet. Multiply length by width to get square feet.
11 x 10 feet = 110 square feet
40 square feet. Multiply length by width to get square feet.