Week 3 Discussion Requirements Modeling Requirements modeling is one of the earlier phases of software development where requirements are captured and analyzed. One area that is oſten overlooked is properly capturing non-functional requirements. After engaging in research discuss one non-functional requirement that is common among IT projects. Be sure to include in your answer why it's important, and what the issues might be if it is overlooked Avoic discussing non-functional requirements presented by classmates.

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Suppose there is a relation r(a, b, c) with a b+-tree index with search keys (a, b).1. what is the worst-case cost of finding records satisfying 10 < a < 50 using this index, in terms of the number of records n1, retrieved and the height h of the tree? 2. what is the worst-case cost of finding records satisfying 10 < a < 50 and 5 < b < 10 using this index, in terms of the number of records n2 that satisfy this selection, as well as n1 and h defined above? 3. under what conditions on n1 and n2, would the index be an efficient way of finding records satisfying the condition from part (2)?

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