The number of species born each year in a new aquarium forms

Last updated: 8/7/2022

The number of species born each year in a new aquarium forms a sequence whose general term is an = (n +9)(n+2). Find the number of species born in the fourth year, and find the total number born in the first four years. The number of species born in the fourth year is The number of species born in the first four years is