3. Vectors

Which of the following correctly expresses the vector $b$ using unit vectors in Cartesian coordinates?

A = (4.0 m)i + (3.0 m)j and B = (−13.0 m)i + (7.0 m)j. You add them together to produce another vector C.
(a) Express this new vector C in unit-vector notation.
(b) What are the magnitude and direction of C?