Two feature vectors and describe the same user in a recommender system. The individual components were discarded during a database migration — only three measured lengths survived:
| Quantity | Value (units) |
|---|---|
The team now needs the length of the difference vector, , to measure how far apart the two profiles sit.
Compute from the three numbers above.
Answer in units, rounded to two decimal places.
Once you get it right, the reasoning behind the answer shows up here.