Add up all the sides.
Answer: 8x2+13y
Step by step: x+9y+8x2-x+4y
x+13y+8x2-x (x-x cancels x)
(put everything in order) 8x2+13y
Short answer: 3240 handshakes.
Remark
If you watch hockey, you've actually seen this happen. After the game, the winning team will stay on the ice usually on center ice. As you look at them, the man on your right will go down the line and rough up or shake hands or say something to each of his teammates on the line. Then he goes into the dressing room. So he has talked to n - 1 people. The next person going down the line will talk to n - 2 people. and so on all the way down the line.
Formula
Sum = (n + 1)*n/2 is what the formula is.
Givens
n = 80
Sub and Solve
Sum = (80 + 1)*80 / 2
Sum = 81 * 40
Sum = 3240 handshakes.<<<<< Answer
They want to make it look cheap by having two meals with 8 dollars, making it the mode, however, the rest are considerably more expensive.
Answer:
158
Step-by-step explanation:
Sarah's expression is correct because for every hour you get 9 dollars so 9(1) is 9 dollars for one hour. Then for two Hours it would be 9(2) which equals 18.
