Final answer:
If Roy furnished more than half of the children's support, he can claim them as dependents in 2017.
Step-by-step explanation:
The divorce decree being silent as to who is entitled to claim the children as dependents means that it does not specify whether Roy or Linda can claim them. However, according to the information given, if Roy furnished more than half of their support in 2017, he can claim them as dependents. This means that the statement 'Roy can claim them as dependents in 2017' is true.