For the last one, you can work out the perimeter of each shape by adding each length of the sides together. Then, you would use an inequality to find the range of values.
Say if the square had sides of length x, and the rectangle had length x+2 and width 2x, and it tells you the perimeter of the rectangle is less than the perimeter of the square.
This is what you do:
Perimeter of rectangle = 2(x+2) + 2(2x) = 2x+4+4x = 6x + 4
Perimeter of square = 4x
Perimeter of rectangle < Perimeter of Square
6x + 4 < 4x
4 < -2x
-2 < x
(And just to let you know, the answer to this is kind of weird as you could have a negative length
)
Make sense?
I've written this very quickly, so if anyone spots any errors, let me know