These requests combine the record, pattern, time and snapshot rules from the unit. The businesses and values are fresh. You still need the same distinction between value equality and identity, between an inclusive boundary and an exclusive one, and between a calendar date and an offset timestamp.
A good answer follows the declared return contract even when another representation seems convenient. The travel credit task returns a signed effect, the museum interval returns signed days, and the report task includes its final newline. For the snapshot task, inspect what happens after the caller changes its own input. If the saved readings change too, a reference escaped the boundary. Work without the guided steps, then use the hints to diagnose the specific rule that failed.