How do polynomials demonstrate the closure property under addition and subtraction?

polynomials are closed under addition, subtraction, and multiplication.

Closure: Polynomials will be closed under an operation if the operation produces another polynomial.

Polynomials form a system similar to the system of integers

answer: domain and range mean all possible values of x and y that could be substituted to the inequality. a solution means all possible values that make the inequality statement true. so while the range is still all real numbers, the solution is the shaded area, for which y will always be greater than the line of the function.