Which is the correct formula for calculating expected activity cost for three-point estimating?

An output of the Validate Scope process is:

A technique used to determine the cause and degree of difference between baseline and actual performance is:

In order to detect quality Issues earlier in the project life cycle, the project manager is using an agile/adaptive environment. What is the main difference between waterfall and agile/adaptive development approaches tor Project Quality Management?

A project manager is searching for solutions that bring some degree of satisfaction to all parties in order to temporarily resolve a conflict. What conflict management technique is described in this situation?