Invert	Inverts a transformation matrix and returns it.
Multiply	Multiplies the current matrix by the specified one, and returns it.
Rotate	Rotates a transformation matrix, and returns it.
Scale	Scales a transformation matrix, and returns it.
Translate	Translates a transformation matrix, and returns it.

Note that all methods return the current matrix they applied on, so that you can easily chain calls on the same code line.