What other methods could be used to ensure parallel rails (any method, not just the geometry kinds)?

The vertices of a rectangle are given in the columns of the matrix . if is found to perform a transformation, what are the coordinates of the transformed rectangle? (0, 0), (0, –3), (–3, –3), (–3, 0) (0, 0), (0, 3), (3, 3), (3, 0) (0, 0), (0, 3), (–3, –3), (–3, 0) (0, 0), (0, 3), (–3, 3), (–3, 0)

What situation is an example of an observational study

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?