1. Evaluate the following limits: (a) \( \lim _{x \rightarrow \infty} \frac{2 x^{2}-3 x}{3 x^{3}-5 x^{2}+1} \) (b) \( \lim _{x \rightarrow-\infty} \frac{2 x^{3}-3 x}{5 x^{2}+x+7} \) (c) \( \lim _{x \r