Subtract 11.485-18.38

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?

If f(x)=x+7 and g(x)=1/x what is (fog)(x)

Multiplying fractions by whole number 5 x 1/3=?