Cora is writing a program to make a motorcycle racing game. If Cora wants the speed of the motorcycle to appear on the screen when the game is played, then Cora needs to add something to the code that will make the speed a(n) . A. input
B. output
C. Boolean value
D. conditional statement

In vista and windows 7, the appearance and personalization option allows you to change the

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)?

Describe a data structures that supports the stack push and pop operations and a third operation findmin, which returns the smallest element in the data structure, all in o(1) worst-case time.