New PMP Question & Answers with explanation

An important change is requested at the end of a project. While this change is needed to solve an urgent issue that could affect business continuity, it will extend the schedule and increase the cost. What should the project manager do next?
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During a status meeting, one of the client's employees asks the project manager for a new product feature. The project manager is unsure who has the authority to approve this request. To what document should the project manager first refer?
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The client agreed to the final product during user testing, but is now having second thoughts. What should the project manager consult to resolve this issue?
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A project manager reviewing the issue log notices that activities assigned to certain team members are significantly behind schedule. What should the project manager do?
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The day before manufacturing is to start, a project manager learns that the engineering design was not accepted by the end user. What should the project manager do?
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