Im stuck i need to find out arc a but i have no clue

The triangles are similar. what is the value of x? show your work.

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)

Identify an equation in point slope form for the line perpendicular to y=3x+5 that passes through (4,-1)