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Niu has decorated xx cards. He started with 2424 stickers, and he used 44 stickers per card. Which expressions can we use to describe how many stickers Niu has left?

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Q. Niu has decorated xx cards. He started with 2424 stickers, and he used 44 stickers per card. Which expressions can we use to describe how many stickers Niu has left?
  1. Identify Sticker Total: Identify the total number of stickers Niu started with.\newlineNiu started with 2424 stickers.
  2. Determine Stickers per Card: Determine the number of stickers used per card. Niu used 44 stickers for each card.
  3. Write Total Stickers Expression: Write an expression for the total number of stickers used.\newlineIf Niu decorated xx cards, and each card used 44 stickers, then the total number of stickers used is 44 times xx, which can be written as 4x4x.
  4. Write Remaining Stickers Expression: Write an expression for the number of stickers Niu has left.\newlineTo find out how many stickers are left, subtract the total number of stickers used from the total number Niu started with.\newlineThe expression is 244x24 - 4x.
  5. Check Expression Validity: Check if the expression makes sense for different values of xx. If xx is 00 (Niu decorated no cards), then Niu should have all 2424 stickers left. Plugging in 00 for xx gives us 244(0)=2424 - 4(0) = 24, which is correct. If xx is 66 (Niu decorated 66 cards), then Niu should have used 2424 stickers. Plugging in 66 for xx gives us xx33, which is also correct.