book Maths Puzzle Numerical Ability

Apply distributive property and simplyfy combining like numbers.
- 2t ( t - 5) + ( - 5t squared) = ?

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HELP TO RENAME USING THE LCM LIST COMMON MULTIPLE OF AS THE DENOMINATOR
1.)1/3, 2/9, 1/6
2.)1/2, 3/4, 5/8
3.)1/3,1/5, 3/5
4.)2/3, 5/6, 2/2 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)