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1)  The sum of a number and its square 
      x + x²   or   x² + x

2)  The quotient of five times a number and five less than the number

3)  The cube of a number added to the product of the number and 6
      x³ + 6x

4)  The square of a number less than its cube
      x³ - x²

5)  Ten more that the difference of twice the number and ten.
     (2x - 10) - 10