20 points !! NEED HELP What is the variable being tested in an experiment?

A. explanatory variable
B. placebo
C. response variable
D. control variable

Do not comment if you aren’t going to . create a real-life situation and create a system and show how it might be modeled algebraically with a system of equations (or inequalities) show all work include a few sentences explaining the situation, your variables of choice and what each represents, and how you would set it up and solve it algebraically. !

Which value of c would make he following expression completely factored? 8x+cy

Why did the ice arena get so hot after the big game (this is math related google it to find the paper