Answer:
1. can be
2. can't
3. can be
4. can
Explanation:
The side length theorem states that the 2 shortest sides of a triangle must be greater than the 3rd side when added up.
For example, the first problem we have the numbers 6.1, 13.7, and 8.2.
The 2 shortest sides are 6.1 and 8.2. When added they equal 14.3, which is longer than 13.7, so this set can be the side lengths.
Hope this helps! :)