Please help i will name brainiest

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)

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

What is the sum of these mixed numbers 4 2/3+ 3 1/9