Which outcome would be a good use for the sum function? check all that apply.

1-determining the amount of supplies needed for a concession stand
2-determine the profits for the concession stand
3-analyzing the average amount each concession shopper spent at the stand
4-figuring the most products purchased by customer
5-determining how much product needs to be replenished for the next sale
6-determining what the expenses of the concession stand were

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)?

Match the feature to the network architecture. expensive to set up useful for a small organization easy to track files has a central server inexpensive to set up difficult to track files useful for a large organization does not have a central server client- server network peer-to-peer network

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