Which of the following describes a hardware error? Select 3 options. -Nothing happens when you press the Power button on your desktop PC.

-Nothing happens when you press the spacebar on your keyboard, but the other keys are working.

-Every time you try to run your new game, it crashes after displaying the opening screen.

-The mouse pointer on-screen only moves horizontally, not vertically.

-After a recent Windows update, you can no longer access the internet on your laptop.

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)?

The most accurate readings that you can take on an analog vom are when the meter's pointer is at the a. center scale. b. extreme right. c. near right. d. extreme left.

Which syntax error in programming is unlikely to be highlighted by a compiler or an interpreter? a variable name misspelling a missing space a comma in place of a period a missing closing quotation mark