Answer:
the second description and and expression is correct
Step-by-step explanation:
the first one is wrong because it says 7 minus while it should be minus 7
The answer is 28 for the volume
Answer:

Step-by-step explanation:
Midpoint of line segment is calculated as
-----------(1)
Here

Substituting values in equation (1)


For the mean you add them all up and divide by the ammount of numbers you added. So it would be 118