Question
Given that $\mathrm{r}=0.4, \sigma_{\mathrm{y}}=3, \sum\left(x_{\mathrm{i}}-\bar{x}\right)\left(y_{\mathrm{i}}-\bar{y}\right)=108, \sum\left(x_{\mathrm{i}}-\bar{x}\right)^2=900$. Find the number of pairs of observations.
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$\lim _{x \rightarrow-2}\left[\frac{x^7+x^5+160}{x^3+8}\right]$
$\lim _{y \rightarrow 1}\left[\frac{2 y-2}{\sqrt[3]{7+y}-2}\right]$
$\lim _{x \rightarrow 0}\left[\frac{\sqrt[3]{1+x}-\sqrt{1+x}}{x}\right]$