Vector AA= (10, 40 degrees above negative x-axis) and vector BB= (20, 30 degrees below positive x-axis). What is the magnitude of A+BA+B ?

Vector AA= (10, 40 degrees above negative x-axis) and vector BB= (20, 30 degrees below positive x-axis). If vector CC is chosen such that A+B+C=0A+B+C=0 , what is the direction of vector CC? Give your answer in degrees, as a positive angle measured counter-clockwise from the positive x-axis.

I'd appreciate it if you could even draw a picture.