I was confused with this question on my math homework which was about subtracting rational numbers. "Cheila buys 40 ounces of pasta at the groceory store. The pasta costs $2.90 per pound. How much does she pay for the past, before tax?"

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?