physicsvectors
posted by Nat .
the components of a vector V can be written (Vx,Vy,Vz). what are the components and length of a vector which is te sum of the 2 vectors, V1 and V2, whose components are (8,3.7,0) and (3.9,8.1,4.4)?

Add the corresponding components to get the components of the sum vector.
The length is the square root of the sum of the squared components 
how do i find the angle between the summed vector and the z axis in this reference frame?

The cosine of that angle is vertical component divided by the vector length.
They don't ask for that angle in your original question
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