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Expressions don't have perimeters. Your (2x-1) might have something to do with the
measurements of some geometric shape on paper, and if it does, then it might be
connected somehow with a perimeter. But you haven't said anything about any of that.
They are two terms of an algebraic expression.
It is a binomial expression in two variables, x and y.
Perimeter of rectangle = 2 x (Length + Width) = 2 x (L + 18) or = (2L + 36) centimetres.
74 units.
There are 4 terms in the given expression