Part a
we have
[tex]6^3=216[/tex]so
in logarithmic form
[tex]\log _6216=3[/tex]Part b
[tex]10^0=x[/tex]in logarithmic form
[tex]\begin{gathered} \log _{10}x=0 \\ \log x=0 \end{gathered}[/tex]Part c
we have
[tex]e^x=28[/tex]in logarithmic form
[tex]\ln 28=x[/tex]