What should a team do when they complete all sprint goals earlier than expected?

A development team for a small company experiences long delays between product completion and release for validation and testing. The company is concerned that this will impact its ability to compete in the marketplace.
What analysis should the team use to understand the issues?

Due to its complexity, a new team member struggles with developing a concise user story What advice should the agile practitioner give to assist with developing the story?

Triple Nickels is a technique used in what kind of meeting?

A legal department representative contacts the scrum master because, while the project's budget has been maintained, it has exceeded its original contracted time and scope.
What should the scrum master do?