The question, as stated, cannot be answered sensibly. A square foot is a measure of area, with dimensions [L2]. A foot is a measure of distance, with dimensions [L]. The two measure different things and elementary dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
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8 feet by 5.25 feet = 42 square feet
There are: 8 times 18 = 144 square feet
10.8 x 8 = 86.4 square feet.
If it is 8 feet by 5 feet then there are 8*5 = 40 square feet
Total square yards: 7.11