Answer:
6
Step-by-step explanation:
1 shook 2,3, and 4's hands
2 shook 3, and 4's hands
3 shook 4's hands
4 already got his hand shaken by everyone
1-2, 1-3, 1-4.
2-3, 2-4
3-4
(Anyone feel free to correct me. I'm not amazing at math just trying to help out.)
(2x7)-3
=11
.................
Step-by-step explanation:
12x - 16 = 2x - 21
10x - 16 = -21
10x = -5
x= -0.5
Answer=30
20%=20/100=0.2
150*.20=30
