Identifying Characters
Which statements are true about the major characters in A Doll's House? Check all that apply.
Mrs. Linde is a friend of Nora's and is now a widow.
Doctor Rank has ruined his reputation by committing a crime.
Nils Krogstad is a family friend of the Helmers' and is gravely ill.
Nora Helmer is the main character and is accused of being a spendthrift.
Torvald Helmer is a bank manager, Nora's husband, and a father of three children.
) Intro
Done

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)?