A vector A(vector) has a magnitude of 15 (in some unspecified units) and makes an angle of 25º with the x axis, and a vector B(vector) has a magnitude of 25 and make an angle of 70º with the x axis. Compute the magnitudes and directions of the vector:

(a) C(vector) - A(vector) + B(vector)

(b) C(vector) - A(vector) - B(vector)

(c) C(vector) = A(vector) + 4B(vector) 

(d) C(vector) = - A(vector) - 7B(vector)