4y because they have like variables (y) you can just subtract them like normal
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You convert an (infix) expression into a postfix expression as part of the process of generating code to evaluate that expression.
it is an expression
A more complicated expression.
A polynomial is always going to be an algebraic expression, but an algebraic expression doesn't always have to be a polynomial. An algebraic expression is an expression with a variable in it, and a polynomial is an expression with multiple terms with variables in it.