This question cannot be answered sensibly. A square foot is a measure of area, with dimensions [L2]. A cubic yard (cy) is a measure of volume, with dimensions [L3]. Basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
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70
0.4
65000
There are 4 sf. The trailing 0s in 4.00700 must be there for a reason and that reason is that they are significant. But, if you multiply a number with 6 sf by a number with 4 sf then the answer can have at most 4 sf.
bx+cy=d bx=d-cy x=d-cy ----- b answer: d-cy ----- b