Developing an Equation from Average Costs. The America Dog and Cat Hotel is a pet hotel located in Las Vegas. Assume that in March, when dog-days (occupancy) were at an annual low of 500, the average cost per dog-day was $14. In July, when dog-days were at a capacity level of 4,000, the average cost per dog-day was $7.

(a) Develop an equation for monthly operating costs.

(Let X = dog-days per month) Total cost = ___ + ___ * X

(b) Determine the average cost per dog-day at an annual volume of 24,000 dog-days. $ _______.