9. Given a term the first 3 terms of a geometric sequence, (9, 3, 1) What is the nth term of the formula? Find the 10th term of the sequence.
10. Evaluate each series, $\sum_{i=1}^{n}(n-3)^2$, using the formulas for the sum of series.
$\sum_{i=1}^{n}c = cn$
$\sum_{i=1}^{n}i^2 = \frac{n(n+1)(2n+1)}{6}$
$\sum_{i=1}^{n}i^3 = \frac{n^2(n+1)^2}{4}$
$\sum_{i=1}^{n}i = \frac{n(n+1)}{2}$