Final answer:
Without specific data on Sam's weight changes over time, it's impossible to give an exact rate of weight gain in pounds per month. To find it, one would need to calculate the total weight gained over a set number of months and divide by those months.
Step-by-step explanation:
Finding Sam's rate of gaining weight in pounds per month involves calculating the average weight gain using the available data and then dividing it by the number of months to determine the rate.
To do this, you would collect the relevant data points of Sam's weight over a period of time, find the difference between the starting and ending weight, and then divide it by the number of months that have elapsed.
This will give you a figure that represents pounds per month.
However, it's important to note that without specific data on Sam's weight changes over time, it's not possible to calculate an exact rate.