What, if anything, is wrong with the following function body which is supposed to modify cost? void calculate(int count, double price, double cost) i/ this function modifies cost { if (count < 0) cost 0.0; else cost count *price; a the variable "cost" should be passed by reference b. void functions must return a value c. the variable price is not declared d. cost is modified twice

Elements such as fonts colors visual structure graphics and the interface of a web page should complement each other to ensure blank

Who needs to approve a change before it is initiated? (select two.) -change board -client or end user -ceo -personnel manager -project manager

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)?