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12m - 18 is simply 12m - 18. The value of the expression will depend on the value of m. Anything else will depend on what it is that you want done.
Area of traingle = Base * Height / 2 = 18*12/2 = 108 m2
If you mean: 12(3+m) then it is the same as 36+12m
2
there are twelve months in one year
286.3