Answer:
Step-by-step explanation:

Answer:
yes
Step-by-step explanation:
they can both be divided by 2
Answer:
z=12x2
30x-24
x=y=30
z=12x2
Step-by-step explanation:
Answer:
The 8th number is -9
Step-by-step explanation:
With an average, the sum of the seven numbers divided by 7 is 15.
In order to add an 8th number, we set up
