A powerlifter uses protein powder to make a smoothie each day after their workout. At the beginning of the week, the powerlifter starts with a 1,175 gram bag of protein. Each day, they use 47 grams of protein in their
smoothie.
1. Write an expression to represent the change in weight of the bag of protein over 1 week.
2. How long will it take the powerlifter to finish this bag of protein powder?