Can you explain the capital asset pricing model (CAPM) and expected risk using the formula

\begin{tabular}{|l|l|} \hline CAPM & E(R)=Rf+(RmRf) \\ \hline \begin{tabular}{l} Expected \\ return \end{tabular} & E(Rp)=WiE(Ri) \\ \hline \end{tabular}