9 How many total numbers can be represented with an 8-bit binary (base-2) system?
А. 127
В. 12В
Ос. 255
OD. 256

Which one of the following is considered a peripheral? a software b mouse c usb connector d motherboard

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)?

Explain how email technologies enable the exchange of messages between users. find out the typical parts of an email address and explain each part.