Answer:
171 (assuming that you want to know the next term)
Step-by-step explanation:
We get from 2 to 5 by adding 3. We then get from 5 to 15 by multiplying by 3.
This pattern repeats so to get from 54 to 57 we have added 3 again so to get the next term we multiply 57 by 3 to give 171.
