360 because you would do 30 bags x 12 necklaces
The addition property of equality states... If a=b then a+c=b+c
Answer:
The average of the grade is 7.
Step-by-step explanation:
Add all of the grades up then divide by the number of grades there are
8+8+5=21
21÷3=7
Have a blessed day! I hope my answer was helpful!!