We informally define the term corresponding element as follows: the first element and the last element of a list are corresponding elements. similarly, the second element and the element just before the last element are corresponding elements. the third element and the element just before the element just before the last element are corresponding elements -- and so on. given that the variable a is associated with a list, write an expression for the corresponding element of a[i].

What is the digital revolution and how did it change society? what are the benefits of digital media?

What engine component is shown in the above figure?

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)?