Answer:
5.21666667
Step-by-step explanation:
yopu do the total bill divided by 3
12 is first one 7 is 2nd one 9 is the last one
Use the substitution method
(9,90) y= 10x
90= 10(9)
90= 90
Answer is yes
18 |16 | 13 | 10 | 9.5 | 8.5 | 7.5 | 6
9.75 is the FINAL answer