How do arguments of definitions and arguments of evaluation happen on social media?

For a study comparing leisure activities of physical education students with those of other students, a researcher has randomly selected a ten percent sample of physical education students and one percent sample of non-physical education students for a list of students. what kind of sampling technique is this?

Facts/data/information/reason to prove the us is democratic

If a(x) and b(x) are linear functions with one variable, which of the following expressions produces a quadratic function? (ab)(x) (a – b)(x) (a + b)(x)