Question

Please help me #3 in the top and #1 and #2 in the bottom. I'm so confused

Answer 1

Question 3
C(1, -7) D(-8, -7)
To find side length DC you count how many units are between the two points.   C(1) D(-8) = 9 units

Question 1
Again count the points around the edge of the square. Since this shape is a rectangle, side length WX = YZ and side length XY = WZ. 
WX = YZ = 11 units
XY = WZ = 15 units
Perimeter = WX + YZ + XY + WZ = 11(2) + 15(2) = 52 units