Absolute value

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Across
  1. 3. What is the absolute value of y if y=2x+1 and x=1?
  2. 5. absolute value of -4
  3. 7. if x>0 then -x is
  4. 8. What is the answer to the problem -|2|?
Down
  1. 1. What is the absolute value of 10x if x = 7.2?
  2. 2. What is the answer to the problem |2| + |-2|?
  3. 4. absolute value of a non zero real number is always
  4. 6. What is the multiplicative identity of rational numbers?