New PMP Question & Answers with explanation

A project manager is asked to use the company's new system for cost estimation after already having completed one. The new system is complicated, and the process will add two weeks to the project timeline. Stakeholder tolerance for extending the schedule is low. However, the new process must be followed to achieve project approval and move to the execution phase. What should the project manager do?
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A project manager is reviewing approved change requests made within the past month. The process has been efficient, but implementation is taking longer than originally planned. What should the project manager do?
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A project manager joins a project as a replacement on a project team. During initial meetings, the project manager realizes there are many differing opinions about how to address technical decisions. Team members do not respect each other's ideas, and the environment is becoming counterproductive. In what phase of development is the team?
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A sponsor is very upset because they did not know about a project change to reduce the budget. The project manager and project team do not understand the sponsor's frustration, because the change was required and beneficial to the project. What should the project manager have done first?
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During project implementation, a functional manager asks to include additional functionality that will benefit the customer. What should the project manager do?
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