Please help with practice problem.

Vectors You determine that when you pick up your phone from your desk it is subject to two forces, call them A and B. A is the gravitational attraction ofthe earth which you describe as A = 2i+j+3k Newtons. B is the force your hand applies to the phone which you describe as B = 3ij+2k Newtons. (a) What is the magnitude of the resultant force R on your phone? (b) What is the direction, in degrees, ofR relative to the i -j unit vector plane