Question 139256
log 0.0001
--> log 10^-4
--> because of the log is base 10, the log and 10 cancels out. Moreover, the properties of logarithm allow us to move the exponent to the front therefore you will get -4log10. After the log and 10 cancels out, you ended up with -4. 
-->Therefore, after the evaluation, the solution is -4.