## Calculus with Applications (10th Edition)

$n,\Sigma x,\ \Sigma y,\ \Sigma xy,\ \Sigma x^{2}$, and $\Sigma y^{2}$
In order to find $r=\displaystyle \frac{n(\Sigma xy)-(\Sigma x)(\Sigma y)}{\sqrt{n(\Sigma x^{2})-(\Sigma x)^{2}}\sqrt{n(\Sigma y^{2})-(\Sigma y)^{2}}}$ , We need to calculate $n,\Sigma x,\ \Sigma y,\ \Sigma xy,\ \Sigma x^{2}$, and $\Sigma y^{2}$ as these are the unknowns in the equation.