10.17 LAB: Data frames The Cars dataset has three columns giving the quality, machining angle, and machining speed of 18 cars. Write a program that performs the following tasks: Load the data Cars. csv into a data frame called cars_df. Subset the first userNum rows of the data frame into a new data frame. Find and print the maximum values of each column in the subset.

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)?

Will this setup result in what kathy wants to print?

Cómo pongo un tomo de llamada sin pagar?