Answer:
12.1 units
Step-by-step explanation:
The problem is asking to find the magnitude of B.
The magnitude of a 3-D vector is given by:

where
x, y and z are the components of the vector along the x, y and z directions, respectively
For vector B in this problem,
x = 9.2
y = 4.8
z = 6.3
Therefore, its magnitude is:
