All formulas that begin with =if will

a. change the formatting of a cell in a specific way if certain conditions are met.
b. return a specific value, calculation, or message if certain conditions are met.
c. always copy the contents of the adjecent cells if they contain data.
d. remove contents from a cell if they will likely cause an error during calculations.

Im doing this last minute and literally none of my neighbors or people that my dad works with use excel so if anyone could me make up an example

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)?

How are stop motion special effects in animated films created