What is the value of the expression -3x^2y + 4x when x=-4 and y=2

(write as unit rate) 12 meters in 2.8 seconds =

Which expression is the factored from of 2/3x + 4?asap

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. !