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• What is 100% divided by 20%?
  
• Ralph's t-shirt shop is having a once-a-year sale. If you buy one t-shirt, you receive the second one for 20% off, the third one for 25% off, and so on. How many t-shirts would you have to buy to receive a free shirt?
  
• Which of the following could be considered a drawback of the Seventeenth Amendment?
  
• What was the western border of the American frontier in 1783?
  
• How do you factor #x^3-8x^2+16x#?