QuestionC/Jsers/ahmad/Downloads/4507091111202211\%20(1).pdf 9) If $f(x)=\left\{\begin{array}{ll}\frac{x^{2}-9}{x+3} & x \neq-3 \\ c & x=-3\end{array}\right.$
If $f(x)$ is continuous for all $x \in R$, then $c=$ a) 3 b) 6 c) 0 d) -6 10) If $y=7$ is a horizontal asymptote of a rational function $f(x)$, then which of the following must be true : a) $\lim _{x \rightarrow 7} f(x)=\infty$ b) $\lim _{x \rightarrow \infty} f(x)=7$ c) $\lim _{x \rightarrow 0} f(x)=7$ d) $\lim _{x \rightarrow 7} f(x)=0$