Online Self-Tests(E3)

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  1. If x – 2.5 = 0.5, find the value of (x – 2.5) + 2.5.

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  (1 point)

  
  

  Answer:

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  2. Evaluate the expression when x x 0.8 = 0.2.

  (0.8 x x) – 0.2

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  (1 point)

  
  

  Answer:

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  3. If x = 19 and y = 5 , find the value of x – 2 × y.

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  (1 point)

  
  

  
  

  Answer:

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  4. If x = 7 and y = 10, find the value of y – x.

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  (1 point)

  
  

  Answer:

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  5. Evaluate the expression when x = 5 and y = 2.

  x x y

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  (1 point)

  
  

  Answer:

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  6. If (x × 10) = 1 and y = 2, find the value of x – y.

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  (1 point)

  
  

  Answer:

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