the way i learned how to find slope from a table was to calaucate 2 points.usually the first 2 pairs. so in your table you would take the points(1,8)&(3,5) then you subtract your x&ys.
I would say B) A parallelogram with all sides equal and all angles equal. Parallelograms aren't all squares. They can be rectangles and rhombuses. I would say B. They all have the same lengths on all sides. They all have the same angles as well. Take a look at the pictures below. They are all parallelograms. All sides are the same, and all angles are the same.