NO LINKS!! Please help with these notes. Part 3a

#1-d
[tex]\\ \tt\hookrightarrow log1000=log10^3=3log10=3[/tex]
#2-e
[tex]\\ \tt\hookrightarrow log_525=log_55^2=2log_55=2[/tex]
#3-f
[tex]\\ \tt\hookrightarrow log_{12}144=log_{12}12^2=2[/tex]
#4-b
[tex]\\ \tt\hookrightarrow ln12=log_e12[/tex]