To find the are of a square, we simply square the value of a side
so..
Area = 25 square units
The answer would be -40 because (-4)*(-2)=8. Then 8*(-5)=-40
1. I don’t know exactly what you need but 4 divided by 7 is about 0.57 feet or 6.86 inches
2. If you are allowed excess, then you will have 7 pieces each at 0.5 feet with half a foot left extra