2r+1+(−4r)+72 i need help...?

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

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?

50 points~ ! i have to turn this in tomarrow