Here are the solutions to the logarithms, calculated to four decimal places:

1. log(9.49):
   $\log(9.49) = 0.9761$

2. log(8.19):
   $\log(8.19) = 0.9135$

3. log(-1.02):
   A logarithm of a negative number is undefined in the real number system.
   $\text{Answer: DNE (Does Not Exist)}$

4. log(5.33):
   $\log(5.33) = 0.7261$

Let me know if you'd like further explanation or assistance.

Related Questions:

1. What is the mathematical reason logarithms of negative numbers are undefined in the real number system?
2. How do logarithms behave for numbers greater than 1 vs. numbers between 0 and 1?
3. How can logarithmic calculations help in real-world applications like pH levels or decibels?
4. What are the differences between natural logarithms and common logarithms?
5. How can you use a calculator to approximate logarithms without a log button?

Tip:

Always check the base of the logarithm being used. If no base is specified, it is assumed to be 10 (common logarithm).