Freddy draw a plan for a rectangle or a piece of material that he will use for a blanket do you have the verticals are (-2.5,-2.2),(-2.5,2.1), and (3.9,2.1) what are the coordinates of the fourth vertex?

Question: the  coordinates of the fourth vertex is (answer )

Three vertices of a parallelogram are given. Find the coordinates of the fourth vertex.  

The midpoints of equal sides of an isosceles triangle are (4,3) and (4,-1). What are the coordinates of the vertices of the triangle if
a) two vertices lie on the y-axis
b) only one vertex lies on the y-axis?

What are the coordinates of the image of vertex G(1,-2) after a reflection across the line y=x?