Explanation:
First, start with a diagram so you can 'see' the situation....I'll us a compass rose coordinate system ( see image below)
Vertical component of point C ( which is the resultant displacement from A)
900 sin(35) + 600 sin (130) = 975.845 km
Horizontal component 900 cos (35) + 600 cos (130) = 351.56 km
Using Pyhtagorean theorem d = sqrt ( 975.845^2 + 351.56^2) = 1037 km
distance from A to C = 1037 km
Bearing of C from A = arctan ( 975.845/351.56) = 70 degrees