#1

(1) A company makes three sizes of cardboard boxes: small, medium, and large. It costs $2.50 to make a small box, $4.00 for a medium box, and $4.50 for a large box. Fixed costs are $8000. (a) Express the cost of making a small boxes, y medium boxes, and z large boxes as a function of three variables: C = f(x, y, z). (b) Find f (3000, 5000, 1000) and interpret it. (c) What is the domain of f