each rectangular table requires 64 square feet how many rectangular tables will fit in 800 square feet​

Icould really use some with this question.

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) = 4x - 3 and g(x) = x + 4, find (f - g) (x)