Answer :
Use the function z = a - 1 to find the value of z when a = 5.
we have the function
[tex]z=a-1[/tex]For a=5
substitute in the given function
[tex]\begin{gathered} z=(5)-1 \\ z=4 \end{gathered}[/tex]therefore
the answer is
the value of the function is 4
Part 2
use the function s=k+8 to find the value of s when k =4
we have
[tex]s=k+8[/tex]substitute the given values
[tex]\begin{gathered} s=(4)+8 \\ s=12 \end{gathered}[/tex]