-8 1/4 I don’t know if it’s adding or dividing 2 1/5

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 are the excluded values? m+5/mn+3m

If the tip varies directly with the number of guest which equation represents between the tip,t, and the number of guest,g?