How do you identify the terms and like terms in an expression

In any mathematic expression, like terms will be the terms with the same exponents and variables. For example, in the expression 2x^2 + 3x^2 + 6x , 2x^2 and 3x^2 would be like terms. This is because they have the same variable(x) and the same exponent(2). Hope this helps.

No a triangle cannot be formed because when you add the two smallest number together (which would be 11) the have to be bigger than the number it is "against" ( which would be 12)