Brainlist if you answered it correctly and give a well done explanation

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)

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-10