A company producing dive watches has established that, on average, a new employee can assemble N(t)dive watches

Question:

A company producing dive watches has established that, on average, a new employee can assemble N(t)dive watches per day after t days of on-the-job training, as given by

(A) Where is Nit)increasing? Decreasing?
(B) Where is the graph of N concave upward? Downward?
(C) Find any horizontal and vertical asymptotes.
(D) Find the intercepts.
(E) Sketch a graph of N.