You work as a cashier for a bookstore and earn $4 per hour. You also babysit and earn $8 per hour. You want to earn at least $56 per week, but you would like to work no more than 16 hours per week.

Given the graph of the linear system, which system is the solution of the real-world problem?

Gravel is being dumped from a conveyor belt at a rate of 25 ft3/min, and its coarseness is such that it forms a pile in the shape of a cone whose base diameter and height are always equal. how fast is the height of the pile increasing when the pile is 14 ft high? (round your answer to two decimal places.) ft/min