ASAP PLEASE, I need help. I also have more questions that I've asked that I need help with

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?

What is the slope of the line (-7,2) (4,6)

Express -5 2/5 as an improper fraction.