book Maths Puzzle Numerical Ability

could oyu give me the help and answers to finding the associative and commuuntative propety 125+347+75... 58+16+2+4...2(25+8)+2(15-8)... 6(40-21)-6(20-1)

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can you help me?
What is the equation of the line that passes through the points (-2,2) and (0,5) ? The sum of 2 consecuttive odd intergers is less than 80.what are the largest possible values for the intergers?