Evaluating an algebraic expression consists of substituting the provided values of the variables to find the numerical value of the expression.
So, in this case, you have
[tex]\begin{gathered} p=9 \\ 8p \\ \text{ Substituting in the expression the value of p} \\ 8(9)=72 \end{gathered}[/tex]Therefore, the value of the expression is 72 when the value of p is 9.
