Which of the following might indicate a source on the internet is not reliable? a. the source has a url that ends in .edu. b. the source has been cited in academic articles. c. the source contains statistics and information about the researchers who compiled them. d. there is no identification of the site's creator.

Jasper and samantha are in a robotics competition. the guidelines state that the robots should be able to move a 10-gram weight at least 2 meters and turn in a circle. jasper and samantha have already built the robot. which step of the design process should they follow next to decide whether their robot meets the minimum criteria for the competition?

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)?

Match the sentence fragment in the first column with the appropriate ending in the second column. a little per favore?