New PMP Question & Answers with explanation

You are managing a heavy equipment manufacturing project that involves many mechanical, electrical, and IT staff. Your team prepared a schedule network diagram using duration estimates with dependencies and constraints. Your team also calculated the critical path for the project using late and early values. Today, your project office has indicated to you that some of the resources you had planned for the project will be unavailable. To deal with this, you explore the possibility of modifying the schedule to account for limited resources. What is your best possible step in such a situation?
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All the following are tools of the Control Schedule process except:
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Mary is a project manager for an infrastructure upgrade project in a government agency. She realized recently that a critical scheduled task exceeded its deadline, and the stakeholders are aware of it. The resource manager has permitted Mary to use three more resources to work on and complete the delayed task. Although the three additional resources prove helpful, Mary is still concerned about the task because:
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In a small office construction project, the following activities are scheduled in sequence. i) Digging and pouring footings: five days. ii) Working on the slab and pouring: three days. iii) Framing the floor: five days. iv) Wall framing: four days. v) Roof framing: six days. vi) Insulation and drywall: seven days. vii) Interior doors and trim: three days. viii) Hardware and fixtures: two days. What is the minimum time to complete the project if all activities are on a critical path except activity viii, and activity iii is delayed by one day?
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James has been managing a hotel construction project on a busy street. He is in the process of estimating activity durations for building walls, and he calculates the most likely estimate as 15 days. If prefabricated material is used, it would take no more than 12 days to finish the work. The work may be delayed and could take up to 18 days if less experienced construction workers build the walls. What is the expected duration of building walls using the three-point estimate?
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