# Math Help - Sequences and series questions

1. ## Sequences and series questions

hey, i wanna delete this dont know how

2. If we take the number of trees in a given year as $T_y$ with $y$ being the year. The formula for $T_y$ would be $T_y=T_y_-_1-\frac{T_y_-_1}{5}+850$. Apologies in advance if this is wrong.