New PMP Question & Answers with explanation

Mandatory dependencies are those that are inherent in the nature of the work being done. They often involve physical limitations, such as on a construction project when it is impossible to erect the superstructure until the foundation is built. According to the PMBOK, a mandatory dependency is also:
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A manager asked to see a list of milestones in the project. This would be available as an output from the:
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A construction project requires that government environmental hearings be held prior to site preparation. What kind of dependency is this?
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To control the schedule, a project manager is reanalyzing the project to predict project duration. This is done by analyzing the sequence of activities with the least amount of flexibility. What technique is being used?
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You are managing a project that has a task to translate several pages of a document into Spanish. This is similar to a project done last year when a document was translated into German. You are not sure how long it will take to translate into Spanish, so you look at the project plan from the German translation and use that activity duration for your current project. What type of estimating is this an example of?
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