Is y=-4 a function or not a function

Graph y ≥ -x^2 - 1. click on the graph until the correct graph appears.

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?

The functions below show the amount of money bella and sweet t had saved after earning money for doing chores. which description best compares the two functions?