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1. Positive integers giving a hole ●●○○○ 20 ptsFind the number of positive integers $n$ for which the graph of $y = \frac{(x + 3)(x - 7)^5}{(x - 1)(x - 7)^n}$ has a hole at $x = 7$.
2. Sum of four rational numbers ●●○○○ 20 ptsAdd $2\frac{3}{5}$, $\frac{-15}{13}$, $\frac{-13}{-15}$ and $-4\frac{3}{5}$. Round the sum to two decimal places.