book Maths Puzzle Numerical Ability

How many diagonals can be drawn from one vertex of a 12 sided polygon?

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a parent who has not had to use this math since high school and my son came to me for help, Help!!! heres two types of problems he has to do 3(6+4) = 3(___)+ 3(4) and my son has to do some simplifys 12(x + 2) or 9 (p - 6) cube root xsquare -1=2