z = 24
Given the expression as described in the question
[tex]\frac{z}{4}=6[/tex]Multiply both sides by 4 as shown
[tex]\begin{gathered} \frac{z}{4}\times4=6\times4 \\ z=6\times4 \\ z=24 \end{gathered}[/tex]Hence the value of z from the expression is 24