WILL GIVE BRAINEST ANSWER TO WHO EVER EXPLAINS BEST!!! At a party, everyone shook hands with everybody else. There were 66 handshakes. How many people were at the party?

12 people

And when the twelveth shakes everyone's hands, that makes 66. So there were 12 people at the party. So n=12

Step-by-step explanation:

*Hope this helps*

5x+10 is the correct one

hope this

1. 8

2. 9

3. 20

4. 3

5. 17

6. 2.2

7. 11.25

8. 1

9. 14

10. 2

step-by-step explanation:

thats the first half