Consider weights and values of items below and a knapsack that can hold at most 20 lbs. item value in $ weight in lbs 1 10 10 2 30 15 3 22 12 4 15 5 5 12 4 assume that each item can be used at most once and can be broken. what is the maximum value of items that can be placed in the knapsack.

Dameas communication challenge is due to which factor

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)?

What are "open-loop" and "closed-loop" systems