Evaluating Limits I am having trouble understanding this question on limits. Suppose that $r(x)$ is a function where 
$$
\lim_{x\rightarrow 0} \dfrac{r(x)}{x^2} =0 \ .
$$   
Can someone please explain how, from the first limit I can show that: 
$$
\lim_{x\rightarrow 0} \dfrac{r(x)}{x} =0 \ . 
$$

$$
\lim_{x\to0}\frac{r(x)}{x} = \lim_{x\to0}\left(\frac{r(x)}{x^2} \cdot x\right)
$$
and go on from there.
