Explanation
According to the Agile Practice Guide, agile project management is an iterative approach to delivering a project throughout its life cycle. Agile projects embrace change and value customer feedback, but they also need to manage the impact of change on the project scope, schedule, cost, quality, and risk. One of the tools and techniques for managing change in agile projects is impact analysis, which involves assessing the effect of a change request on the project objectives and deliverables. The project manager should perform an impact analysis on the schedule and budget based on the additional scope requested by the executive steering committee, and communicate the results to the relevant stakeholders. This will help the project manager to determine the feasibility and desirability of the change, and to negotiate the best course of action with the executive steering committee and the project team. References:
Agile Practice Guide, Chapter 5: Implementing Agile: Creating an Agile Environment, pp. 77-97.
PMBOK Guide, Sixth Edition, Chapter 4: Project Integration Management, pp. 111-158.
PMP Exam Prep Coursebook, Chapter 4: Project Integration Management, pp. 4-1 - 4-24.

When a team member is struggling with a task, it is beneficial to leverage the experience within the team to provide support. This not only aids in the completion of the task but also contributes to the development of the less experienced team member's skills. By asking a more experienced team member to assist, the project manager fosters a collaborative environment where knowledge sharing is encouraged, and team members can learn from one another. This approach aligns with the PMBOKGuide's emphasis on team development and the PMI's focus on continuous learning and improvement within project teams.
References: The approach of having an experienced team member support another is consistent with the principles outlined in the PMBOKGuide, which advocates for project managers to develop their team's competencies and enhance overall team performance. Additionally, the Professional in Business Analysis (PMI-PBA) reference materials highlight the importance of collaboration and knowledge transfer in project environments to ensure that all team members are equipped to contribute effectively to project objectives.