Wirte an expression that should have a variable and a constant

What are “like terms”? why can we only add like terms?

Which of the following expressions is equal to 2x^2+8

Ms.ortiz sells tomatoes wholesale. the function p(x)=-80x^2+320x-10, graphed below, indicates how much profit she makes on a load of tomatoes if she makes on a load of tomatoes if she sells them for 4-x dollars per kilogram. what should ms.ortiz charge per kilogram of tomatoes to make on a load of tomatoes?