Here we can use the rule we used in Part A directly since the 105 is already written as a power with the base 10.
What should you raise 10 to the power of in order for it to equal 1? Any number, except the number 0, raised to the power 0 equals 1. That means 1 can be written as 100.
To calculate log(1001), we will rewrite the argument as a power of ten, and then use the same method as previously.