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proverbialtoast
Hello,

If you lose 3 pounds per week, after 3 weeks you lose (3)(3) = 9 pounds.

The change in your weight is represented by the integer 9 (pounds).

Hope this helps!

Topmadworld
In your first week- 3 pounds is lost

#3 weeks later= 3 x 3
                       = 9 

Thus 3 weeks later 9 pounds is lost