Try this solution (see the attachment, it is consists of 3 steps).
Answer:
B
Step-by-step explanation:
You have already asked this type of question. so now you know how to do this.
6 persons means he shook his hand with 5 people.
like wise add all handshakes
5+4+3+2+1= 15 handshakes
30.31 because of u do 29-4.37 then u add 5.68 and that's how u get your answet
12x^2+62x+80
Do you want a step by step?
