New PMP Question & Answers with explanation

The business case documents the business need and the cost benefit analysis that justify the project. The summary of how the project has achieved the business needs identified in the business case is document in the:
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How does the role of a project manager change based on managing projects using a predictive development life cycle then managing projects in adaptive environments?
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Which of the following approaches can assist in managing ambiguity risks?
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Unless an enterprise-wide ERP is deployed in an organization, disparate IT systems perform specialized tasks in a project. Which of the following systems typically processes supplier’s payments after obtaining all the necessary certification of satisfactory work?
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Three years back, your organization awarded a fixed price contract to a reputable local contractor to construct a new airport terminal in the city. A few days back, you received a change request from the contractor requesting to adjust the contract’s price. The contractor is claiming that as a result of the recent national recession, the prices of raw materials have gone up and he cannot complete the rest of the project at the contract price. Is the contactor’s request legitimate?
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