User Vector A⃗ points in the negative x direction. Vector B⃗ points at an angle of 34.0 ∘ above the positive x axis. Vector C⃗ has a magnitude of 17 m and points in a direction 46.0 ∘ below the positive x axis. Given that A⃗ B⃗ C⃗ =0 , find the magnitudes of A⃗ and B⃗ .