Oooh I don't know the exact wording, but it is the property that states that the order of the numbers in the equation can be switched and still equal the same thing as long as the signs are still kept.
The equation is 41+5x for the cub's weight. x represents the month. So, it would be plugging 4 into x. Which gives us, 41+5(4)= 41+20 = 61. The cub will weigh 61 pounds in 4 months.
