New PMP Question & Answers with explanation

A management control point where scope, budget and schedule are integrated and compared to earned value for performance measurement is a:
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You are a consulting project manager and an investment bank has a contract with you to run a large information technology project that is expected to last 15 months. During the Direct and Manage Project Work process, you discover that several regulatory requirements were addressed in the project management plan but missed from the scope statement. Failure to meet these requirements could result in legal action against the company. However, implementing the technology to comply with these regulations could exceed the budget and scope of the project and result in the cancellation of the project. What should you do?
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The project management team has determined that there are some changes to the scope of the project. According to the PMBOK, who is responsible for reviewing, evaluating, and approving documented changes to the project?
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If you are working on a project where there is no definite detailed scope, but there are similar projects in the past, what is the correct Estimate Activity Durations tool to use?
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How does time-boxing help minimize scope creep in agile projects?
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