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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Apply distributive property and simplyfy combining like numbers.
- 2t ( t - 5) + ( - 5t squared) = ? Explain the conditions under which a quadratic equation can be solved using simple rearrangement versus using the Quadratic formula. Is there a way to decide, from the structure o