The graph of y = f(x) is shown below. What are all of the real solutions of f(x) = 0?

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?

Plz hurry evaluate the expression a+b where a=8 and b=19

What is the the greatest common factor ?