（1）the anwser of number 1 can be any point ,because you didnt tell me rotate around which point

(rotate around point A ,C'(-1,-3)

rotate around Point B C'(-3,1）

rotate around point C , the martix of point Cno change (2,2)

rotate around the origin , C'(-2,-2)

(2)file:///C:/Users/Public/Pictures/Sample%20Pictures/New%20folder%20(2)/133.htm

In numbe 2 , I guess the image rotate around point (-1,1) clockwise 90 degrees , so the marix of point B' is (2,1)

(3)the figure rotate around point H（-2,2）counterclockwise 90 degrees,then the marix of point E is (-2,7)

(4) the figure rotate around point C (2,2) clockwise 90 degrees ,then the martix of point B' is (0,-1)