How to explain it(*?????)

5. (10 pts.) Mark each statements True or False (Give an intuitive explanation of your answer). . (1) Let T : R2 - R2 rotates vectors anticlockwisely about the origin through an angle 0, then T is a linear transformation; (2) When two linear transformations are performed one after another, the combined effect may not always be a linear transformation. . (3) The map T : R2 - R2 given by T (" ) - ( -it 30 ) is a linear transformation