If it's a geometric sequence then:

We calculate the fourth and fifth term of the sequence:

Answer:
In year 4 15.1875 animals.
In year 5 11.390625 animals.
From the instructions i gather it might be like this
Answer:
y = 7x - 5
Step-by-step explanation:
y=mx+b Where m is the slope and b is the y-intercept
Budget ≤ 1250 - 439
m = $811