Find the sum to $n$ terms of the series $10+84+ 734 +\dots$
1. $\frac{9(9^n+1)}{10}+1$
2. $\frac{9(9^n-1)}{8}+1$
3. $\frac{9(9^n-1)}{8}+n$
4. $\frac{9(9^n-1)}{8}+n^2$