Waylon is back-to-school shopping with his mom at a large department store. He’s picked out the following items: 3 pair of pants for $87 total, 4 t-shirts for $48 total, 1 backpack for $35, 1 hoodie for $26, 1 pair of shoes for $37. When they get to the register, they see this sign:

Which of these is a benefit of social networking? oa. hiding your true identity from friendsob. avoiding talking to people in personoc. spending time with friends instead of studyingod. connecting with new people

Lisa’s company, abc ltd., lost its biggest client and is now facing a financial crunch. most of her colleagues have resigned, but lisa decides to stay with the company and assist the management in overcoming the financial situation. which quality is lisa demonstrating? a. self-management b. cooperativeness c. responsibility d. loyalty

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)?