Finding perimeter of a square.

A square on a coordinate grid has horizontal and vertical sides. The upper left vertex of the square is located at (-3,4). The perimeter of the square is 40 units.

What are the coordinates of the other three vertices?

b.)What percent of the area is in each quadrant?

c.) Suppose you translate the square one unit to the right. Does this translation change the percent of the now existing in the third quadrant?

I got this for A.

Upper Right Vertex (7,4)

Lower Right Vertex (7,-6)

Lower Left Vertex (-3,-6)