New PMP Question & Answers with explanation

A team member informs the project manager that there is a variance between actual and planned system speed. The project manager is surprised, because this performance measurement was not identified during the planning phase of the project. The project manager then evaluates whether the variance requires a response. During the evaluation, in which phase is the project manager?
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A project is 45 percent complete when a project manager learns that an outsourced key resource will be unavailable for an extended period of time. This will have a serious impact on the project's schedule and budget. What should the project manager do?
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A project is in its execution phase. Due to a new regulation, the client asks for additional documentation to be delivered within the contract. What should the project manager do?
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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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