Abreeding group of beavers is introduced into a protected area. after t years the number of beavers in the area is modeled by the function

n(t)= 54/0.35+0.68^t

1. how many beavers were initially introduced?
2. estimate the number of beavers after 5 years.
3. determine the change in the beaver population between t = 5 and t = 10.

(note: all answers are whole numbers.)