Final answer:
To find the average change in weight each month, divide the total change in weight by the total number of months. In this case, Rob lost 40 pounds in 8 months, so the average change per month is 5 pounds.
Step-by-step explanation:
To find the average change in weight each month, we need to divide the total change in weight by the total number of months. In this case, Rob lost 24 pounds in the first 6 months and 16 pounds in the next 2 months, for a total loss of 40 pounds in 8 months. To find the average change per month, we divide 40 by 8. So, the average change in weight each month is 5 pounds.