In each case, identify the slope and give its meaning with the appropriate units.
(a) The function N = −70t + 5000 models the enrollment at Maple Grove College during the fall of 2018, where N represents the number of students and t represents the time in weeks since the start of the semester.
(b) The function C = 3.5n + 700 represents the cost (in dollars) to rent the Shakedown Street Dance Hall for an evening if n people attend the dance.