In parts (a)-(d), find the values of the sums in terms of n. In part (e), evaluate the limit of the sum from part (d). a. $\sum_{k=1}^{n} k =$ b. $\sum_{k=1}^{n} \frac{k}{n^2} =$ c. $\sum_{k=1}^{n} \frac{9}{n} =$ d. $\sum_{k=1}^{n} (\frac{7k}{n^2} - \frac{9}{n}) =$ e. $\lim_{n \to \infty} \sum_{k=1}^{n} (\frac{7k}{n^2} - \frac{9}{n}) = $
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