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.
Answer:
2/10 or in its simplest form 1/5
Step-by-step explanation:
there is 2 grey marbles so 2/10 (there is 10 marbles altogether)
so half of 2 is 1 and half of 10 is 5
so the answer is 1/5
Opening several new lines of credit