You wrote a list of steps the user will take to perform a task. Which statement is true about this step? You have drawn pictures of what your screens will look like and identified the input-process-output that occurs on each screen.
You have defined a use case.
Your app is functioning and ready to test.
In this step, you defined your target audience and main goal

Which spereadsheet type will determine how well a bussiness has done over the past year

If the polar bear were taken out of the food chain what would happen to the seal population the seal population would diminish the seal population would grow dramatically the seal population would stay the same the seal population would decrease slightly

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)?