A parallelogram is a four-sided shape with opposite sides that are both parallel and equal in length. The area of a parallelogram is the base times the height. A trapezoid is a four-sided shape with at least one set of parallel sides.
3/-7 is equivalent to -3/7z
If there are 12 shirts total and three of them were green, it would be 3 out of 12 or 3/12. Hope this helps! :)