UPSKILL MATH PLUS

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Choose the right integer property that applies to the following conditions:
 
1) 191 =19 + 1 
 
2) −28 \(+ 0 = \) −28 
 
3) 140 + ( 1 + 19) = ( 140 + 1 ) + 19 
 
4) (-28)+(-15)=-43