What is true about the process of converting analog data into digital data (Choice A) The digital version is a representation of the analog data but cannot include all of the details. (Choice B) To make the digital version be a more accurate representation of the analog data, the process should use fewer bits to represent each sample. (Choice C) A longer interval between measured samples means more details will be captured in the conversion from analog to digital. (Choice D) The digital version contains all of the details of the analog data, as long as enough storage capacity is available.

When using a public computer or network, you should always

Which option allows you to view slides on the full computer screen?

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)?