Answer:
a=2,b=4. (3a+b)=3*2+4=10.
This is an answer should help you
Answer:
2 13/20
Step-by-step explanation:
The answer is

i hope this answer helps you!
When finding the mean you should first add up all the numbers which are 12,2,8,6 and 57 which will give you a sum of 85 next you should divide your sum by how many numbers there are which is 5 and your answer should be 17