I NEED HELP ASAP!! My semester quarter ends next wednesday and I really need help on CMU CS Academy Unit 2, 2.2.3! Please help me, I really a, struggling! Here's one of them I'm struggling in.

How do you make a lenny face? plz, brailiest to who can answer first.

Complete the sentence about a presentation delivery method

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)?