\text { a. } \lim _{x \rightarrow+\infty} \frac{2 x-3}{x+1} \text { b. } \lim _{x \rightarrow-\infty} \frac{x}{x^{2}+1} \text { c. } \lim _{x \rightarrow+\infty} \frac{2 x^{2}+3}{3 x^{2}-x+4} Q5. Determine the value of each of the following: