Answer:
The change of base formula says that
[tex]\log_b(a)=\frac{\log_x{a}}{\log_x{b}}[/tex]
You can choose any base x that are positive and not equal to 1
By using change of base:
[tex]\log(20)=\frac{\ln{20}}{\ln{10}}[/tex]
assuming log is in base 10
