Missing part of the question
Determine the number of handshakes, i, that will occur for each number of people, n, in a particular room. (people)
Answer:

Step-by-step explanation:
Given
For 5 people

Using the given instance of 5 people, the number of handshakes can be represented as:

The above sequence is an arithmetic sequence and the total number of handshakes is the sum of n terms of the sequence.

Where
--- The first term
--- The last term
So:


I'd go with: D. clockwise 90 rotation; reduction
(Hope I helped :D
the answer is d and now pls help me pls
Answer:the answer would be 20
Step-by-step explanation:
because it is use the most
Answer:
D.
Step-by-step explanation: