Yes.
It is a numerical expression.
11+(7-3)2=
It is 25.
The expression simplifies to 5x + 6.
It is either 3*2 + a or 3*(2 + a)
3x plus 2y - 3 is an expression. There can be no answer to one expression and one linear equation in two variables.
(7-3)^2 plus (7-1)^2 = 16+36
3(2 + y)
2(2x + 3)
18(2 + 3)
It is an expression because it does not contain an equality sign.
3(2y + 3)(y + 2)