Number 4 i have absolutely no idea how to do. i generally understand finding distance on the coordinate plane but this has really confused me. .

For Part A, in creating the square, you did it correctly.

Now for Part B, you can create a right triangle by adding a point at -4, -3, and we'll call it, say, T.

Then you can use the Pythagorean's Theorem to find the length of one side of the square.

The Pythagorean's Theorem is 

A would be the distance between P and T, and B would be the distance between Q and T. So then, a would be 7, and B would be 2. 

To fill it in, it would be 

or 49 + 4 = 

or 53 =

or  = x

Which is equal to about 7.28

Now multiply that by 4 to get the perimeter, or 29.12

So the perimeter would be about 29.12