The number of items produced by a machine, , is a function of the time , in hours, the machine operates. The function is given by . Which of the following is the best interpretation of in this context?
The machine produces 8 items in 120 hours.
The machine produces 120 items in 8 hours.
The machine produces 15 items per hour for 8 hours.
The machine produces 120 items per hour for 15 hours.
